How to test 18650 battery cells to use for battery packs
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- čas přidán 3. 11. 2016
- itvraag.nl
After testing you’ll be able to determine the capacity of each cell, which helps you to decide if it’s still usable for your purpose.
Equipment:
Voltmeter
RC charger (IMAX B6), Intellicharger i4
4 trays
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thanks man! many useful information in a short video, thanks again!
Thank you for the info, does it make a difference to use inr and bfn batteries together?
Thank you for the video on Charging and discharging to determine the capacity of used 18650 (or any Li-ion Battery)
Though the illustration was short, it was made in such a way, to make the viewers understand the concept very well. Thank you.
Most YT explanations are ALWAYS vague in explaining the capacity testing and determining.
Regards.
Hello, i made a 16,8v battery pack for a drill, but the problem is when i push the button voltage starts to decrease and it keep doing that until i stop pushing the button just then voltage go up slowly until it reaches the initial voltage, how can i fix it? And why it happens?
Where do get the battery tray to hook up to hobby grade charger?
Did you add those heavy leads to the battery holder or did you buy it that way? I'm looking for a good quality battery holder.
Same charger i have. Big job - got about 50 batteries to test
On that charger (I have a different branded one) that bottom right number is the mAh that's been charged or discharged?
correct me if I am wrong but in your video you advise us to set the battery balancer charger to LIPO despite the battery here is a Lo-Ion 18650.
why discharging at 0v? are lipo batteries not to trash away if cell is under 2v?
When i was trying to charge my batteries the charger said that it was a nimh battery then hits me with an error. Can somebody please explain why thats happens
with regard to the B6AC80, is it the same device compared to the Revolectrix Dual PowerLab 6 Touch? please
Does the capacity decrease after the batteries are used a lot? And when you measure the voltage are they fully charged? Or discharged?
I know this was 3 years ago but for anyone else wondering the capacity does decrease after they are used a lot and when you measure the voltage it doesn't matter too much if the battery is still within the safe safe of 2.5 to 4.2v.
Helped me big time repairing my drill batteries been messing with cells to find out which ones are which also some haven’t got codes on so I don’t know the voltage it’s there a special machine I can get cheers
After capacity testing, should you leave them at the 3v? or charge them back up to nominal 3.7 for storage?
Charge to nominal voltage (half charge) for Lithium batteries
One bty cost and bty power kitne hai
My battery pack is totally 4 18650 battery’s connected 2 each parallel and series I having one 12v 1.2a charger I used 7808 regulated Ic with a shut resistor of 5w try to charge but the 7808 going too hot within seconds can anyone help me to solve this problem
how to test 18650 battery total capacity without lowering the cut off voltage too much?
Can you figure out the mah from the marking of the Lap top...
example...they're rated at 10.8 v.....basically 3S @ 7800
There's 9 batteries...so that's 7800 divided by 3 =2600 mah
Basically 3 sets of 3S
So I should get 1s @ 2600 mah
From another Lap top pack there's only 6 -ea.
It's rated at 4400mah
so it's 2 set of 3S
So It should be 1s @ 2200 mah
It's not exaclty rocket science..
But how do you figure out the C ratings???
10.8v 4.4ah 48wh...are what's marked on it...
10 C ??????
I have aproblem measuring capacity maybe you can help me.I have turnigy accucel 50w original and also xstar v4 charger original too.I discharge one cell and gives me 1500 mah than i charge with turnigy and get 1800 .If i discharge and charge with xstar i get at charge 2000 mah .What am i doing wrong?
I am wondering if when you are doing the discharge capacity checks if you are using the same amperage on all 3 tests? Do the batteries charge up to the same level when using the different chargers? Verify the charge level using a multimeter.
You should also be aware that capacity readings on charge cycle are never very accurate. The discharge capacity is really the only true way to get battery capacity
Do you test the voltage before or after charging?
late, but before. If a lipo goes below a certain voltage it gets damaged.
Battery ka amh maltimitar se kase nikale
Why charge on liPo setting when its a li-ion battery?
I'm sorry but i think that it is very important to check the batteries after a stockage of a 2 weeks after loading/unloading. Then first check voltage for the unloaded cells, if below 2,7 volt, throw away. For the loaded cells 4.2v is excellent, all between is acceptable for testing as shown at your video.
Thanks for the feedback!
Can you please show in more details the correct steps like how to use the multimeter.
Mousa Alzwani set the multimeter to VoLTE dc. Black on negative red on positive
Thank you
@@jameswalsh6810 my multimeter does not have that setting plz halp
Set it to V, in DC
If I have 18650 cells with >2.5 V. Can I assemble them to make a battery for my laptop? (I dont have B6 and intellicharger i4)
Two years late but no.
@@shadowmaster8020 Why not ?
@@AbdulMoueedHaroon Internal resistance would be way too high meaning self discharge would also be high. This makes the battery useless. This would be ignoring the safety risk of it having dendrites inside, which would cause a fire from internal short circuiting.
@@shadowmaster8020 Thank you.
It means, although a full charge on a poor battery will give 4.2 volts but it will not be retained. The battery will fall to lower values below 2.5 very quickly.
@@AbdulMoueedHaroon Yep exactly that. I also forgot about the mAh (capacity) being very decreased and the heat build up while charging.
Hopefully it's expanded your knowledge if you didn't already know (:
My laptop battery all is in good condition, shows 4volt each in multimeter but the charge doesn't even last 5 min, can you help me plz
Thanks.
I have HP probook laptop. Battery down after 20 mint. I check all cells on 20 DC on multimeter. All showing 3.2, 3.4 charge.
So why batteries down after 20 mints
Some laptops desable the battery after a certain number of cycles, as a safety feature.
i have got some batteries out of my old laptop battery and i have checked with my meter and it is showing out put 5.4 or so , so far i have seen the most cells have max 4.2 what may be the cause of this does any body knows what could be the reason and over charged cell or i am not checking properly :/
Ahmed Ammar Khan - Open-circuit cell voltage measurements mean nothing. You have to charge them fully, then place a large load on them for a short period of time, then measure the voltages. This would be a way to compare the cells.
The balance board inside the pack has failed it's duty lol maybe damaged now discharge it lol
When you're getting the batteries out of old laptops how do you know if it's a lipo or a lithium ion?
FFS bro lipo is the flat pouch batteries square or rectangular ....li.ion am 18650s 26650s shaped like typical AAs but bigger
Ment to have a sticker and a pdf download to instruct on maximums and what chemistry
nice vids man
U need more views man
How to charge a 18650 with ov
Under 2.5v isn't ideal, but it doesn't mean that they are bad. I've had good cells start of at 0.5v with tested capacity over 2200mah with normal self discharge.
Neil McAliece hello, I have 4 lg ds2 18650 from a laptop battery, I was searching its caracteristics but I can't find anything about them, I just want to know if you have ever tested them? I want to know if i can use them for vaping, and I think you know that it could be dangerous to use a wrong battery, I hope you can answer me, thanks for the video and sorry for my english, I'm still learning to speak it. Greetings from Guatemala!
Dead right Niel ....people seem intent on throwing away perfectly good cells ...even cells with 500mAHrs have a higher energy density than new lead acid, and will last longer than lead acid .... those that read 0V can have internal protection reset and are mostly good .
@@ak42069 I will consider it, but, pass me your id to search you, and make you my first friend if i give it a chance
I had a 17year old dell battery and all cells were at 0.7v. I grabbed another battery at 4.2v and i touched the positive and negative to the cell and got it up to 2.2v which is enough for Nitecore UM20 to charge. Once it gets to 3v it goes quickly up to 3.7 and gets slower with no heat. They may be 700mah but still lose 0.3volts in 1 week. Pretty good right?
No cells were bad. Just fully discharged below 2v
If battery have no voltage do you still charge them to use them.
No, those are dead.
@@itvraag why? Maybe it was just not charged for a long time?
Old video, but needs correcting, you select LiIon on the B6 iMax charger, voltage should be 4.2v max charge and nominal 3.6v, not 4.1/3.7 you have been testing all your Lithium Ion Cells as Lithium Polymers.
Why lipo it's supposed to be li-on
why are you using the wrong cell type setting.
saladdogger mine has....
immrnoidall The LiPo and Li-ion are the same technology in different form factors. They have an identical charging process
immrnoidall well that answers my question I want to know how he knows the difference between a lipo or a lithium ion? My ice charger has two different settings for lipo and lithium ion.
@@sasodoma they have different max charge voltage and discharge cut-off voltage. So the settings do make a difference.
@@steffie.morris Charge and discharge characteristics of Li-polymer are identical to other Li-ion systems and do not require a dedicated charger. Safety issues are also similar in that protection circuits are needed.
batteryuniversity.com/learn/article/the_li_polymer_battery_substance_or_hype
I thought these cells should be changed to 4.2v if you google it?
Apparently you can nearly double their lifespan (amount of recharges) by only charging them to 4.1V and keeping them around 3.5V or so in storage/not in use so it doesn't stress the batteries interior.
Very interesting and informative 👍
Thanks for watching
How do you know which are the faulty batteries?
You can check that, based on amount of voltage. Below 2.5V it's dead. Also based on charge/discharge rate. When charging/discharging measure the total amps.
@@itvraag Below 2.5V after its been used or when? Are you saying that if the battery was used then it is impossible for its' voltage to go below 2.5V if it is good?
It should never go below 2.5V, even when the battery is drained.
why do you need so many cells??
I just bought 3,000 of them for my PV system. It's quite difficult to store significant energy with just a few hundred cells.
veeeeeeery slow if you need to test 100s or 1000s of cells..... any gadgets that can do 4 or 10 at a time?
Is capacity AH please let me know
Yes, battery capacity, measured in ampere-hours (Ah), represents the amount of electric charge a battery can deliver over time, with one ampere-hour equal to one amp of current supplied continuously for one hour.
I have done exactly what you did even checked new batteries from Aliexpress that are meant to be 3000mah but they only show up as 1400 to 1500mah this means they have sold me low mah batteries correct please let me know so I can ask for refund I sent them screenshots and they have gone quite on me too
On minute 1:20 you mention that a cell below 2.5 V is automatically a bad cell... That can't be correct. Would you mind to explain that part in detail? I'm working with Lithium Cells and Alkaline Batteries in order to get a better understanding of their charges and behavior in different aplications and from what I know ( as an aprentice) is that a cell with less than 2.5 V can still be charged up to 4.2 V, and later giving you a charge of 3.6V. A cell with 2.5 V or less is just a very discharged cell, and doesn't necesarily mean it is dead. In my opinion, if a cell gives you a value that goes jumping around like crazy or a value that is way higher than expected (f.ex.: 254.412 V) or stays on 0, thats is a bad cell and can surely be tossed in the recycle bin. Please let me know if I'm wrong here, but it just doesn't make any sense to me to toss every cell under 2.5 V just cause of that. In the end I just plug those into a Li-Ion Battery Charger andit charges up to 4.2. There's some devices that actually drain the cells down to a very very low value (that being things like remote controls and all apliances that are capable of drawing a 3.6 V load but for example a lower load too, using a coil to step up the charge (i think you know what i mean).
You are very wrong. EVERY Li cell below 2.5 V has irreparable defects, simple because of the physics of the cells at this voltage. Of course they can still be charged up to this level, but it may result in exploding or burning cells anytime. Never ever recommend to charge lithium cells, that have been kept below 2.5 V even for a short time, to anyone!
@@ElwynnEldoriath Please elaborate in detail. A completely discharged cell will go to 2.5 v and may be further if further discharged. It can be recharged to 4 v. How do we know it has gone bad or it is just very under charged.
Do not throw cells away under voltage all lithium ion cells can be restored by putting them in the freezer for 48 hours let it defrost and charge if it doesnt hold any voltage at all line it up with a charged cell in series and it will charge from the other cell then it can be charged to full capacity hope this helps
no kidding, freezing them fixes them?
I never would have guessed
He is trolling. Dont listen everything on internet...
From the moment you set the charger to lipo for a li ion battery, I realized it was time to skip...
It doesn't matter that he set it to lipo when charging them. Lipo's are fully charged @ 4.2V, same as 18650's. It only matters when discharging them because, like you probably know, you can't discharge lipo's as low as 18650's. But if you look at the video (3:18) you will see that he set the cutoff voltage to 3V, which is correct when testing 18650's.
@@HBrsz Hello sir. In general you are right, but for me it doesn't work like this. There is a reason for li-ion and li-po setting in a charger. Yes it's almost the same but, there is important differences between two chemistries. 4.1 volt per cell and 4.2 v peak, is a huge difference for the long run. Anyways the topic is huge.Anyone is responsible for his actions and as you probably know, those batteries can bite you back hard... I have 6c lipo batteries for my rc helis from 2010 and all perform in their specs, because i treat them by the letter, as it should. Over and out
@@raptorkoko Did he charge the batteries in the video incorrectly by setting it to lipo and charging them to 4.2V @ 300mA?
@@HBrsz yes
not a lipo battery
It doesn't matter! He charged and discharged them correctly. He charged them to 4.20V @ 300mA and discharged them to 3V @ 1A.
@@HBrsz the charger he is using will charge a LION battery,
so he should use that setting, not LIPO.
Prueba con esta manera czcams.com/video/lQ2SFLMPfew/video.html
You used but type of Mike
Please give me 3cell
use mike
Why do you test 4.2v cells by only charging to 3.7v? Makes no sense.
+Len Zielenski
I charge to 4.2v
++itvraag - how much did u buy it the balance charger, bro..? it looks exclusive..:)
I had the same question the charging screen said 3.7V(1S), I assumed that this means it would charge to 3.7 volts, 3.7 is considered the nominal voltage so maybe that is what it was displaying rather then the max voltage. Can you comment?
Daniel Hughes
Those chargers allways display the nominal(storage) voltage. They charge to 4.2V
Nother Chineseium copy of that b6 charger FFS 🤣 they got bank of smd resistors inside with no fan on them rite by the balance ports
They all the same with that screen and few other chargers use the same circuit design Idea but contain MOSFETs aswell cost £80+ FFS
please dont make any video :D
Dm
Why not?
Why lipo it's supposed to be li-on
It doesn't matter.