Fiido D2 Original Battery Details & Double Battery MOD
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- čas přidán 28. 12. 2019
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Some of the most asked questions about the Fiido D2 are answered in this video:
- Is the original battery removable or replaceable?
- Is there a compatible battery to replace it?
- How can you add a 2nd battery for double range.
Best places to get Fiido bikes from localized warehouses (US, EU, UK, etc.)
bit.ly/FiidoOfficialStore
bit.ly/AlternativeStore
You can also now join the largest Fiido owners group: / fiidoelectricbike
Parts & tools to make the mod:
Original Replacement battery bit.ly/3MVj5QO
Battery (external): bit.ly/2BOHffH
12AWG silicone cable: s.click.aliexpress.com/e/bgIDtPeg
XT60 connector: s.click.aliexpress.com/e/pNiK8k0Y
Needed tools & materials:
Soldering iron (power 60W+): bit.ly/3q1AZHF
Heat shrink
Solder (tin) wire
Duct tape
Music by Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
creativecommons.org/licenses/b... - Věda a technologie
Best places to get Fiido bikes from localized warehouses (US, EU, UK, etc.)
bit.ly/FiidoOfficialStore
bit.ly/AlternativeStore
You can also now join the largest Fiido owners group: facebook.com/groups/FiidoElectricBike/
Parts & tools to make the mod:
Original Replacement battery bit.ly/3MVj5QO
Battery (external): bit.ly/2BOHffH
12AWG silicone cable: s.click.aliexpress.com/e/bgIDtPeg
XT60 connector: s.click.aliexpress.com/e/pNiK8k0Y
Needed tools & materials:
Soldering iron (power 60W+): bit.ly/3q1AZHF
Heat shrink
Solder (tin) wire
Duct tape
The battery is no more. Where to i find yhe same pouch u used?
Thanks for the video. I used your advice to trouble shoot a problem I was having and now it is fixed.
Thanks for watching!
This is gold! Thank you for sharing!
Thanks for watching!
Hey mate, splendid video. Thank you so much for your upload.
Thank you!
Excellent tutorial. Have replaced all battery and controller battery connection with XT60 connectors.
Second battery is in Ibera bag and rack behind saddle on DS2.
I'm glad that you have found my video useful, great to know that you did the upgrade! Now you can enjoy longer range.
Thank you very informative cleared up some questions I had. Keep up the good work.
Thank you for the appreciation!
Bravo man și un mare mulțumesc!
Great detailed video, really useful as I have a dead fiido D2 after just over a year :(
How many times did you charge it? And is it really that bad? Iam planning on buying one from a guy that has it over a year now..
My D2 has 4000km the original battery still has 7200mAh from the original 7800mAh.
Thanks for your time make this video 👍👍👍
So nice of you
Excellent video. Thank you.
Idea; 3d print a casing for the additional battery ( although this fabric bag works too)
That is a great idea! Sadly I'm not into 3D printing (for now) si my knowledge is limited.
TechTronic9000 believe me when I say, is way easier than you'd think. I was nervous about it too initally too 🍻🍻
Be sure to watch some videos on this before you buy a 3D printer. Videos like this one can be helpful.
czcams.com/video/LvGKfevdf_Q/video.html
There are also a number of user developed upgrades that users have developed themselves for various printers...many of the upgrades can even be made by the user on the printer to be upgraded!! Some printers have a more develped user base than others as well...which can make a big diff in solving problems.
How well do 3D plastics hold-up to UV from the sun?
Also, wouldn't it take a LOT of spools of plastic filament to make a strong-enough battery case?
PA12 HP 3d printed nylon should be UV resistant.
A very useful video. Great idea!
Glad it was helpful!
Brilliant, thanks
Thank you!!!
Excellent stuff! A big thanks...
Glad you liked it!
Thank you from France !!! Very interesting video !!! And well done.
Thanks!
Bonsoir jbai pas trop compris c’est pour gagner en autonomie ? Puissance?
With two batteries you get better autonomy.
@@TechTronic9000 Thank you, there's a system to unbug to gain speed? Fiido ds2
Only if you change the controller and that will increase the speed to around 29-31km/h when the battery is full.
Very helpful video!
I'm glad that you found it useful! Thanks for watching.
Top man. Would love to see if he can make the fiido ds2 go faster? Maybe even swap out the battery and controller and replace the rear wheel with a 350w or 1000w. Keep up the good work 👍💚
Thank you 🙂💯
Thanks for watching!
thank you very much
Glad it helped
This is a great informative video that explains exactly how to replace the battery safely and i see batteries advertised that have a higher than 7ah and what are the benefits of putting a 10ah instead of the standard one that was factory fitted?
Thank again for a great informative vid...
If the new battery ** truly** has bigger capacity then your range will be bigger.
Thanks so much for this video bro . Great point about the voltage difference is this the same for all e bikes and E scooters
I'm glad that you have found my video useful. Thanks for watching.
thanks!
Thanks for watching!
Great video. Thank you. I ordered exactly what you recommended. So now have three batteries a replacement, the additional one and the original). The original has lost half its capacity (so probably only get 5 miles from it ). Would you recommend connecting them all up in parallel to give me a 36v 21a battery ?
Yes you can use all of them together, just be sure to have the same voltage when you connect them
Thanks so much for a great informative video. Do you think it's possible to make the existing battery into a removable battery. For example adding a cover/case for the battery . Just like the removable battery for samebike.
Only if you instal it on the outside with another connector
Thank you for the video ! can you please share a trusted battery reseller ? ( would love a 14aH 36V battery to replace the one I have)
Very good video, i need your help.
A+++
Any videos on how to replace puncture on the rear wheel? Seems complicated even for and I know my way around bikes. Ebikes are a new world to me thanks
I will do a video when I will replace the tire, it's fairly easy, similar with a normal bike, just unzip the ties that hold the motor wire. No need to disconnect it as there is sufficient slack to work on the tire next to the bike.
Great video. Thank you very much. Good base to build a solution for a removable battery. But after I have removed the cover (plate) and the charging socket I cannot pull out the battery out of my D1. Is the battery blocked inside or should I remove the screws on the upper side of the frame?
The upper screws might be too long and will hit the battery, remove them and see if it comes out.
Brilliant, thanks for this demonstration. I’m very interested to see what you do with the L2 as I’ve ordered this model.
Hopefully you will show how to unlock the speed limit and how the disconnect the speed alarm.
I was interested to know, if I unlock the L2, would this stop the speed warning sound? Or would I have to disconnect controller wires?
To achieve this..
I have a Question, can the computer/ monitor on the handle bar be upgraded, as I would like to have a speedometer and distance traveled display over just lights indicating battery status alone.
Video for the alarm is coming soon ;) Also some new upgrades!
The disabling Fiido L2 speed alarm guide video is here (thank you, TechTronic9000!): tinyurl.com/u6lu8mp
Now only looking forward to TechTronic9000's Fiido L2 true speed unlock instruction video. :-) :-) :-) See the video "It's done! No more limit on the L2!" by TechTronic9000 (Thank you!): tinyurl.com/wm22z7r
Thank you very much for your helpful review! It really gives a easy to understand in depht knowledge how to upgrade to a parallel battery setup. I just have one question. How do I have to operate when both batteries have a on/off switch? Connect first and then switch them on? And when connected, do I have to keep them on all the time? Same while charging? Sorry for a lot of questions.
Would be great to hear from you!
Best regards form Germany!
Mike
Both batteries are fully charged and then connected in parallel with plugs, then you just use the bike like it has one single bigger battery, you also charge it as usual, so basically you don't ever need to disconnect the batteries.
@@TechTronic9000
Thanks for your reply!
Both batteries are fully charged.
So when I connect, the batteries they should be switched on? They have a on/off switch.
Sorry for bothering you
There is no on/off they have XT60 plugs
Thanks for the fantastic videos about e bikes you do.
Do you have recommendations for waterproofing and generally protecting external battery.
I can get another 7.8 AH battery for just £70 so was thinking of adding it to the outside on the left side of the bike. I think the battery is the same physical size as internal battery.
I do a lot of riding in the woods so I imagine I may have to buy and fold some alluminium sheet to protect it from puncturing maybe?
Use a good bag and maybe some extra wrapping of the battery. Water might get in and damage it. You might also find a hardened battery case for the bike frame to give it some extra protection.
Hello,most informative video out there,but still couldnt find an answer if these bikes/batteries has a replaceable fuse? Thanks
Some batteries such as the one from the L2 has a fuse, others don't. Usually the safety is based on the BMS module of the battery that also provides short circuit protection. You can also add your own inline fuse for more safety.
@@TechTronic9000 thanks a lot for getting back! Very informative!Keep doing what you doing !🙏
Very good videos on the D2! Can you tell me how you can carry shopping? I only found a front basket, because a rear rack is not possible, right?. Do you know more on accessories? Thank you
It's possible to add a rear rack, check it here: facebook.com/groups/FiidoElectricBike/permalink/3202797169742151/
Paul 😍
Just watched your video, very good and informative. I have a question, how do you turn off the bike with the key if you have a second battery installed, isn't the second battery live all the time the way you have wired it?
You can disconnect the plug
All the parts & details are listed in the video description, click on show more to see them. Also you can join here for more discussions: facebook.com/groups/FiidoElectricBike/
@Dutch Boy No, you need a BMS for the extra battery.
How much additional range do you get with the extra battery? Percentage or mileage...
I get about 30-35km range now, while with just the original battery i would have gotten about 20km on the same route.
InstaBlaster...
Sir, I know this is an old video but may I ask if you could upgrade this to a Bafang mid drive motor? thank you very much!
Great video, do you have any idea how to replace the front light?
If you want a more powerful one then you need one with a dedicated battery as the controller has low current output and you will burn it with a more powerful light.
Great video...So, what is the reason that you don't link the external battery on the same side of the frame as the original? One other question: Have you thought of doing a mod for converting the internal battery to an easy to remove (for charging) battery pack? I just ordered the D2 and the non removable battery was one of my only niggles. I really like the look and great reviews on the bike. But, it would be much nicer if I could pull the battery for charging and not have to plug the whole bike in.
My battery from the video is a DIY one, made with SAMSUNG 3000mAh high discharge cells and a big 45A BMS.
Hello and thank you for your very interesting video. I was wondering if you had considered adding a gating diode to each source. I realise that a forward voltage drop of between 0.6 to 0.7v would occur using silicone diodes. Using schottky diodes would reduce the forward drop to a much lower level. Just thinking!!!
It's not needed as long as the 2nd battery has a common wire BMS, this means that charge / discharge port is the same so it shares the same voltage with the other battery and they are always balanced between them. I have extensively used this system in several of my ebikes and it always performed as expected.
Great vid!
I have a few questions.
1) is the speed limiter engaged even when using the pedaling mode without E-assist? Like if i wanna go down a hill at 40kmh, will it limit it to the given speed limit?
2) i know that there is a way to remove the speed limit on D1, is it also possible on D2??
many thanks!
Thanks for watching!
1) If you go downhill there is no limit the bike will free roll, got 50km/h on my D2
2) There is no such thing as speed unlock on D1,D2,D3, L2 because they are limited by the battery voltage and motor. All you see on youtube are fake videos with bikes going downhill, just to get views.
You did a great job sir, which camera did you use to get such a professional video?
For the video I have used my Xiaomi Mi 8 phone, it works really nice in 4K
TechTronic9000 Wow, you didn’t attach any external mic on it?
Nope, it's the standard phone mic, i don't understand why so many people say that the Mi8 has "bad sound" :) Most recent videos are made with this phone, including outdoor reviews and it works great.
Thanks for the very useful video! If I would install a more powerful battery, what’s the maximum ampere the motor and/or controller can sustain? Keeping the same voltage....
For capacity there is no limit, the bigger it is the longer the run time will be. It's important just to keep the same voltage.
TechTronic9000 thanks! Do you think the controller and the motor will sustain a 48V battery?
The controller no, the motor might be ok.
Hey I gave two questions. I bought a replacement battery. It has a charge port connected to the battery. Can I charge it outside the bike?
2. I can't get that metal screw attached to the charge port inside the bike undone! Even with plyers its stuck and awkward!
Hello. 1) Yes, 2) yes indeed, a real fiddle sometimes to take it of, needs patience and and a good tool.
Great video, Would like to buy one of these bikes but not sure where to trust and get one from please
Check description of the video, i have some trustful sellers there. Also if you are from Europe I might be able to find you even more better deals and some discount coupons. Also you can join here for more info, videos, deals, reviews etc: facebook.com/groups/FiidoElectricBike/
TechTronic9000 hello thank you for reply, I’m from the uk and that would be great if you could let me know some sites, thank you
@@TechTronic9000 Hey man, I'm just wondering if you have any discount codes for a D4S? I joined the FB group but I can't seem to find any. Thanks :)
Hello, I've just added on the group a new coupon for the d4s ;)
Hi, thanks for the video is very helpful.!
I had a question for you? Are those two battery has to be the same Volt as it 36v 7.8Ah ? Or can I put same Volt but with different capacity like 36v 12Ah? Thanks
You can put only same voltage, but capacity can be different, the bigger it is the more range you will get.
Great video I just have one question do you know what type of charger the d1 takes and where to buy one
Yes you can get the original one for the D1 from here: bit.ly/3jBAMF9
Hello. To make less complicated for me cos i might blowup the batteryes. Is it posible to add swich... so use 1 batery then when first finishes to swich to second battery
Thanks this is the best explain how to do .
The switch method is even more dangerous.
@@TechTronic9000 how about creating a plug and play method by manually connecting 2nd battery via xt60 when 1st battery has discharged during a ride?
Hi, thank you for this video!
Do you know if this battery have BMS inside? And is kind of safe to use?
I heard a lot about cheap li-on batteries catching fire and now I'm panicking when charging 🙈
It has a BMS and it's safe, my bike has 3000km already with zero issues and lots of charges!
Would the 10ah battery from the D1 fit inside this bike?
No
Hello, i have the D2s. That has an other controller. Do you know if this is possible with the D2s?
Yes it's possible.
Saw the title and thought you were gunna replace the pack inside with one twice the size. You can fit 52 cells in that space for a 13s4p pack, upgrade to 48v 12ah!
The frame is too small, you can just replace the current "2600mAh" cells with something like 3500mAh LG MJ1 and will have a jump in capacity from 7800mAh to 10500mAh
hi, very nice your video. I would like to ask you how to boost the speed of a d2s credit line?
because I have a fiido d2s but it goes too slow and I would like to make it go faster.
Hello, it's not possible to do easy. The single way to increase speed for the D2s is first to change the controller + display, this will give you a ~29km/h top speed only when the battery is 100% full. Then if you want to go even faster you need to charge the battery to a 48V, a controller for 48V, display for 48V. The original motor might work on 48V but will wear out faster. So you will probably end up also doing a motor upgrade. It's easier and better to sell it and get something faster such as a ADO A20, that unlocks from settings and does up to 35km/h.
I was wondering if the external battery was the same size as the original, could you use this external battery as a replacement battery?
You can use any kind of external battery as long as they have the same voltage.
Great video! I have a question, iam going to buy a second hand fiido d2 from someone who has it a year now, I’ve seen the bike and everything looks okay, i will do a testride tomorrow. Iam only worried that the battery is maybe already bad, how can I check this? Is there a certain amount of km/miles that the bike rides, or charge cycles? And are there other things i should pay attention to before buying? Thanks in advance!
You should get around 20km on electric mode, mine has 4000km and the original battery is still very good.
Great video, the link to the replacement battery is not working for me, do you have a new one?
Try this one: bit.ly/3eKbEds
Anyone know where can I find spare parts??is there a link or site??i need the connection cable from battery to the charger!!
A lot of thanks from Warsaw/Poland. By the way, the link to the replacement batery is not valid anymore. Can you recommend another baterry withe the biggest cappacity which fits? Thx
Depends on how much the 2nd battery needs to be, for a another 8Ah you will get double the range. Then weight comes into the equation, as maybe you don't need so much range that you end up crying a large battery all the time.
Hi I’ve ordered the D1 with the 10.4ah battery. Is there any other way of identifying the battery size without actually removing it? Thanks for your time and very good video
Without removing it? Probably the only easy method would be to obtain a battery analyzer. You charge the battery pack and then use the analyzer to measure the Ah while it is discharged by the analyzer.
However, keep in mind that if you don't even want to open up the battery
compartment, you will then have to come up with some sort of mating
adapter to connect the analyzer to the battery connector exposed when
you "fold" the bike. Otherwise, you could simply "clip" the analyzer onto the backs of the power connectors on the battery compartment's connector plate. But, if you're at this point then you may as well read the label. However, an analyzer will allow you to measure the ACTUAL capacity of the battery. The company labels are often overly "generous" when specifying battery capacity.
The measured capacity is often lower than the specified/rated capacity. E.G., a "reasonably" decent 10.5Ah battery pack might MEASURE 9.5Ah. The difference depends on the quality of the cells in the pack, and whether the pack has been used a few times. Measuring the capacity of a new, unused pack generally measures a bit lower than the final capacity after the battery has been through a few charge/discharge cycles. Also , the higher the quality of the cells in the pack, generally the closer the measured capacity will be to the specified capacity. Low quality cells can deliver less than 70% (or lower) of the specified capacity. Decent cells will be closer to the specified capacity. 90% or higher is "reasonable".
Here's an example of an analyzer that costs about US$40. It's not laboratory grade accurate but this type is generally good enough for hobbyist work. This analyzer can also measure at current discharge levels NEARER to that of a typical small e-bike and will show you what you can expect in reality.
Lower watt capacity analyzers will give you an artifically high capacity measurement for your real-life e-bike assessment, as they can't load the battery as much as a high wattage analyzer. But, the high capacity analyzers offer the flexibility of measuring either for the specified capacity or can be used to measure nearer what you get in the real-life implementation capacity.
Generally, the higher the test load on the battery pack, the lower the measured capacity. E.G. testing a battery at 100mA will measure considerably more Ah capacity in the battery and will be closer to the specified capacity of the battery pack, than if you test the same battery at 2000mA or 4000mA (0.1A x 42V = 4.2W, but 4.2A x 42V = 176W).
czcams.com/video/8TEtt2IFCVc/video.html
There are other analyzers that can test a high capacity battery.
Just with a capacity/discharge meter, still a bit complicated.
@@TechTronic9000 Hiya..great video..I would like to build my own battery..did you use a 'kit' or just buy the separate batteries, etc... thanks Gerry
Great video, do you not having issue til now charging them using the bike’s charging port?..is the bms of your external battery has separate charge and discharge config or common charge/discharge?..if my external battery bms is common charge/discharge config, will it is still be safe to charge the two batteries ( internal and external) using the bike’s charging port?..thank you and sorry for my querries..
No problems until now and has several thousands OK km done. A big advantage is that the second battery has a common wire BMS thus discharge and charge works on the same port.
@@TechTronic9000 thank you very much for the quick reply I subscribed..
@@lezmac3104 Thank you! I highly appreciate it.
What type the ext.batt did you use, 10 x 18650 in series and parallel this array in many to got sufficient AH ?
My DIY battery is a 10S2P with 3000mAh Samsung SDI cells so a total of 6Ah/36V, it's compact, light and almost doubles the bike range.
Hey I enjoyed the video c as n you do o the fido m1 pro if you get a chance
I don't have a M1 to work on, but the process is similar with the one I did for the xt750, you can check that video also.
Hello would this duoble battery mode work with fiido m1 pro?
Yes it's the same procedure.
If i simply change the battery for a new one (on my own, not at a bike shop), this will not void the warranty?
Not really as there is no seal.
why did you not connect the 2nd battery on the battery side and keep the controller isolated when they are being connected?
Because it's easy and you have a hole in the frame already. Why drill the frame and connect to the existing battery and complicate things?
Hi will this be the same process for the Fiido M1 Ebike? Thanks
Yes it will
is it possible to replace by Fiido 4DS battery 10hamp ?
Yes, your can remove it and replace it. You can also make it removable, join here for more info: facebook.com/groups/FiidoElectricBike
Ciao e complimenti per il bel video,volevo sapere se la batteria interna è da 10 AMP e quella esterna è da 6amp ma entrambe a 48volt possono essere compatibili,o devono assere uguali sia di AMP e di volt? Ringrazio anticipatamente,e un saluto da Venezia,Italia.
Entrambe le batterie sono 36V. Quello interno ha una capacità di 7,8 Ah, mentre quello esterno ha 6 Ah. Perché sono in parallelo, la loro capacità si somma. Non collegarli in serie in quanto ciò brucerà la bici!
Is it possible to combine a 48v silverfish pack and a 52v silverfish pack if the voltage is the same when connecting?
No, both need to be the same rated voltage, also this bike is 36V!
What is the maximum lenght of the battery to fit in frame? Might be longer or not?
There is not enough room to fit a longer battery.
One more question...as I'm new to this kind of motor setup: On many brushed motors, you can simply increase voltage to increase speed. Is this not possible with the brushless wheel motors? I was wondering what would happen if you increased the battery voltage to 48V. Would it be too much for the controller to handle?
Yes it is possible with another controller and another battery, but then you have a chance of burning up the motor.
I bought a 2nd hand fiido d2s on september , as i can notice, since November there is deviation on battery about 30% 40% and that concerned me.....
So i want to ask this , maybe it is time to full replace my baterry ? Or on winter/autumn Lithium batteries it is normal flow to have loss of energy?
A Lithium battery can loose up to 50% capacity when the temperature drops 20°C.
I picked up a used 20ah L2 battery I converted for another bike. Any idea who makes the cells or the cell models? Are they cheap off brand or something decent like LG, Samsung, Sony, Panasonic? Cheers!
Fiido doesn't use branded cells so they might be anything out of china. Still they work pretty well as on my D2 i have over 4000km and from the official 7800mAh I still have ~ 7300mAh.
@@TechTronic9000 Cheers for the follow up on this. Much appreciated.
Where u buy the pouch for external battery?
I've bought mine from a local bike store, you can also find the same model here: bit.ly/39rN4vD
Hi can you give any advice on how to speed up a D2s The holding the brake and switching on for 5/10 seconds does not work I believe it does on the D2 and D1 though 14 mph max most annoying
There is no such thing as speed unlock on D1,D2,D3, L2 because they are limited by the battery voltage and motor. All you see on youtube are fake videos with bikes going downhill, just to get views.
Thanks for the video! Question: the battery of my Fiido d2 is exhausted, so I have to change it. I see incredibly high costs, but then on a famous ecommerce of almost totally Chinese products, I found one very cheap (there are also others on the same site, in general the price never increases much compared to the original piece). Are they still valid solutions in your opinion?
This battery also has slightly different specifications from the original one, such as the size. Your measurement is 30cm in length, this is 280 * 68 * 38mm.
Can it fit the same?
Sadly I see the stock original battery price went up to 300$, it was under 200$ not a long time ago. I would personally measure it and search on aliexpress for a similar one, then ask the seller for exact dimensions.
Does the bag used to store the 2nd battery not move around with the weight, with it being held by Velcro straps? Also it may be better to make a hole in the bag (or buy one) that allows cable to run through. Therefore there is no cable sticking out of a zipper.
Yes, there are a lot of better options to fix the battery, some are suggesting 3D printing a hard case that will clamp on the frame. This was mostly for demonstrating the whole process.
@@TechTronic9000 how is the setup going for you now, has it been good and what range are you getting?
Do you think you could place a d4s battery in a s2d frame ?
I don't think it will fit.
Hi, great video. Could you plug it straight into the charger port?
No you can not as the charge port is not meant for high current draw that the motor takes so it will overheat and burn out along with the wires and bike
Nice video. I am a fiido d2 owner and once I was holding the key while I tried to put the charger cable to the input when suddenly the key accidentally touched the input and created sparks. Does this accident maybe cause any problem to the battery? Also after what distance/time is good to replace the battery?
Thanks in advance!
Did it touch the charge port or the charger cable? You should check with a multi meter if the charger is OK.
My charging point pin has broken off in the frame section, is this hard to replace and source myself ?.. the electric bike repair shop here in Dublin is closed due to the covid lockdown restrictions, please can you advise me.. Thanks in advance !
If the DC jack has failed then you need to buy a new one and replace it. I doubt that you will find one that 100% match so you need to use some soldering and have some knowledge about electrics / electronics.
This idea works on the surface, but not entirely safe method and not efficient because,
1. two different BMS - different charging-discharging rate, thus it will create potential energy differences. If high current is drawn, one can damage another.
2. different
capacities of the battery packs - unbalanced current draw in order to maintain the same voltage level, they can charge and discharge each other.
Better way to do this is have all the batteries under one BMS.
Separating two battery systems by a switch is also a neat idea. But manual charging for two battery packs required.
1) Because it's BMS to BMS they will share the load. Even if it's not equal and let's say you "take" 90% from one battery / BMS the other 10% will come from the 2nd battery. There is no problem here as long as initially the bike was using 100% of just one BMS. Also you can not unbalance them as being in parallel the voltage is equal at both BMS, while the cells groups are balanced by the BMS.
Separating with a switch is a good way to burn a BMS by rushing power from the full pack to the empty pack. Also a battery switch from battery 1 to battery 2 is also trouble as you need a serious contact for whisteting constant 12+A @ 42V (more than 500W) power.
@@TechTronic9000 Sorry I couldn't fully understand the "initially..." and “serious contact…” , but yes you are unlikely to run into trouble with this system. And also you are right about the voltage but I was talking about unbalanced current and capacity.
As BMS is an essential for battery packs, there also are bms control / gate control devices to monitor and control the BMS devices, but you will be fine if it’s only about 12A output.
And you can safely isolate two systems with dpdt switches(ON/OFF/ON).
The unbalance between the two BMS will always balance itself with no problem. Also the second (external) BMS should be one that also supports charging via discharge plug ;)
Hi my battery made a flame at the first charge now I'm afraid to charge it
Hi! Can i add 14ah external battery to original 7.8ah? Both 36V
Yes you can
Hello, My D2 wire is burned by itself (I saw the smoke coming out through the back side of the bike where all wires go into the hole of the steel bar) when I park it outside when it's a hot day, around 28 degrees. And there's no screen when I insert the key. Could you kindly let me know what's wrong with my bike?
Hard to diagnose just from the issue above. Could be a short circuit, burned BMS, etc. Join on the group here and add some pictures and we will try to sort it out: facebook.com/groups/FiidoElectricBike/
Hello do you think we can do this on himo z20 thank you .
I don't know what battery the HIMO has, the old QiCycle had a smart battery and it was too complicated to do this mod.
My fiido tured off it self even full battery.. can you tell me what's the issue
Could be several things such as faulty battery, controller problems or more simple ones such as lose plugs and wires.
Se puede poner un cambio de marchas de la D2S a la D2?
Yes it is possible.
Pleasa how can we get this extral battery?
Link is in the video description
How is your usage experience of this 2 batteries setup?
With the original one I was getting 20-25km range, with the extra one I now get ~35km range. Acceleration has also improved a bit as there is a lower voltage drop.
Sir, at 7:25 in the video, what kind of connectors are those used by Fiido? plan to make a y-connector instead. Please help
It's a kind of bullet connector. you might replace them as they do not provide a very good contact.
@@TechTronic9000 thank you very much Sir!!!
What charger do u need for the d1 can someone drop link to it ??
You can get the original charger from here: bit.ly/2YfqkOp
Nice video!! The link for battery on AliExpress is not working. Is it still valid link?
You are right the product / link was no longer available, I have updated to a new battery model: bit.ly/37BFjRS
@@TechTronic9000 this also doesn't work!!
36v 20ah is a good external battery, or you don't recommend, 36v 10ah is the recommended?
The bigger the capacity is the more mileage you will get, you just need to find balance between weight / size and the needed daily range.
Can 25km limit restrictor be removed?
Fiido D1, D2, L2, all of these bikes are using planetary geared motors which spin very fast and have a reduction gear inside thus providing very good torque. the downside of such kind of motor is that is very limited in providing speed, for instance the ratio is ~ 4.5 to 1 so the motor is spinning 4.5 times per each wheel revolution. So all thees bikes are physically limited by the top voltage of the battery and the designed motor speed (KV - turns per volt), thus ~ 25km/h is the speed that the motor will be able to run under load at full battery voltage. If you don't trust this then you can check my controller swap video in which i replace a stock Fiido "350W" limited speed controller with a 1200W one capable of unlimited speed (99km/h) and the result is exactly ~ 25km/h.
Where would buy a back wheel for this bike please 😁
Aliexpress.
1: Do both batteries have to have the same bms?
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2: how much is the extra battery?
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3: How many km can you travel now?
Thank :D
1) No, it's the original battery with it's own BMS and a 2nd battery that i DIY built and has a common wire BMS.
2) It was cheaper as I have built it, you can get cheap good ones already built from this specific store: bit.ly/3HA7ByO
3) The original battery had 7800mAh, the 2nd one has 6000mAh, before the upgrade I was doing 20-23km on full electric, after the upgrade the range went to 30-35km.
Hi I have Dohiker electric bike I replace the battery and now it’s showing the ECU error sign do you know anything about it
I think I damaged my bike by put connection negative to positive I think that’s the problem
What should I do?
If you have installed the battery with reversed polarity you might have burnt out the controller.
Hi if i change new 48v controller an connect 48v battery its ok for original 250w hub motor?its fiido d2s thanks
Usually overvolting the motor works, but you need to check the temperature, also if you increase the voltage try to keep amps low and not put to much power into it.
Hi if i put new controler whit lcd on my fiido d2s do i make my bike faster? Thanks
Your link for the battery no longer seems to work and i need a replacement. Can you tell me what i need to just replace it lie for like with original range?
You can now get the updated original replacement which has better quality that the one i had in my dead link: bit.ly/3MVj5QO
@@TechTronic9000 Thank you! Do you know where it ships from?
They have multiple warehousing, if you are from the EU it will come as an EU product. If they don't have it in local shop, they will send it from China to their warehouse firstly, then they will repack and ship it from EU to you.
What is the range or how many extra miles you can do now? thanks!
With the original battery (7.8Ah) I was doing ~ 20km on 100% electric, with the extra battery (6Ah) i can do 30-35km. If you install a larger battery you can get even more range.
@@TechTronic9000 Thanks prietene ;)