Nice project. The only thing I might say is you should set your voltage about 0.3V higher to account for the diode dropout voltage - what you are seeing on the display is output from VR - voltage drops as it goes through the diode so you won’t be able to fully charge the battery as you have it set up. 👍
I would be inclined to position the smoothing capacitor on the input of the DC - DC converter rather than stuck on the transformer to keep it away from the heat. This should extend the life of the electrolytic if it is kept cooler.
Thanks for your video. The solution you propose is not a convenient solution, where every month or so you use your Imax charger for balancing. Hobbyists can probably do it, but if the drill is used for work, it becomes impractical.
thanks for sharing, Correct me if I'm wrong. I saw in the drawing and installation for the diod was different. On the drawing, the diod was on plus(+) side but on the regulator the diod was on the minus(-) side.
Thank you very much for your videos. You help me to understand few concepts with my old NiCd drill batery charger. And also with mi first time toenail fungus :-). My problem is i have a very good and strong bosch 24volt 1.5 A drill. The Nicd bateries (20s 1,2 v) are pretty dead, they take charge, not too much, but 1 min working they come off. Realy i use it only not so much, and i think that change to lion bateries, change the charger to make posible charging lion, find the balancer and do all the work, and buy all the material, is pretty to much for the use actually i do with. Instead i was thinking convert it to directly corded to AC, but it is no so easy to find at home a transformer from 230V AC to 24 30V DC and wich supplies minimum 10A. Also it exist the possibility of adapting a ATX Pc power supply, but i would like something that i can put inside the old bateries case. My cuestion if you can help me if it is posible to use a swichting power suply 230VAC TO 24VDV 6A like the one i put you in this link czcams.com/video/Cy8I4RfRlQg/video.html That is able to connect directly to 230 AC and gives me the 24vDc and 6A max that i need instead of bateries. No transformer needed, no bateries needed, no balancing needed, no charger needed, and it is able to put inside the batery holder. Understanding that now i use the drill a couple of times a month.. Realy thank you for transmiting your abilities and i will tell you in a couole of months how my toenail goes..
Awesome video! Thank you! One question: what is the purpose of the diode between the buck converter and the load? Hasn't the current already been rectified?
Great job! And If I wanna use my original Bosch charger to charge upgraded Ni-Cd battery (with li-ion 18650 cells and BMS board inside) can I do the same upgrade with my charger as you in this video?
Thanks, nice, but lots of work for a charger. You can buy a Li-lion Lithium battery charger buck converter CC CV module with led light that turns red while charging and green when done. I think it will stop charging also to protect the li-ion battery from over charging (for less than $5). It also has adjustable voltage coming in and out so, you may still use the DC converter inside the unit. That was before the Corona virus that you can order thru ebay from China. BUT, building diy is more fun though.
hi ive ordered the parts off ebay for covert nicaad to 18650 charger im using samsung cells x10 plus bms 20v 5s2p probably be bigger case though.thanks for video.
Hi there, real nice tutorial and well build-ed , can i ask you, so far after a year and so did this charger still working,did you made any more mods on it? I am thinking of building one and i was wondering if you have made any better one .
Hello and great instructions on this conversion. I have a 18 volt dewalt charger that I would like to convert. When I opened it up there is only a very small transformer on the pcb. If I use a power supply that has a output of 24 volts DC do I still need to use the capacitor in your drawing? Thanks for a great video. Dennis Eller
In your circuit drawing, the diode connect to positive of output voltage regulator but in video, you have it connected to negative terminal. Which one is correct?
yes i always connect the balancer while charging for safety. otherwise imbalanced batteries could explode while charging. which once happened with another charger that i made.
It's confusing me. Why in video description suggest to use 1000uf, 35V capacitor but in your circuit drawing you used 2200uf, 35V capacitor instead? Which 1 is correct or any explanation? Please advise,. especially author/owner.
In simple terms They are used in a reservoir fashion so the “size of the reservoir” doesn’t need to be precisely 1000 anything in the thousands should be good. For voltage is recommended to always use a capacitor rated for twice the normal voltage. Like on a 5v circuit you will find capacitors rated for 10v or 16v. For a 12v you could just use 24v capacitors but they don’t make 24v capacitors so the nearest value is 25v or even 50v is fine. Just have at least a minimum of 1.5X margin.
Yes it will be okay, because your transformer will be designed to reduce the voltage from 220v to 20v. So long as the secondary voltage of the transformer is lower than the maximum input voltage of the DC - DC converter it will be fine.
Interesting video but your project lacks is a mechanism which cut off charging when the battery pack is full. Otherwise you have to supervise the charging process and remove the battery manually before it explodes
I want to make a dead 15.6v panasonic to li-ion, it is ni-mh, how many 18650 would i need and where could i get a battery protection circuit? Any ones on aliexpress etc all are 14.6v 18v 24v etc
lm2596 max current is 3A. there is no way to limit current. so it gets very hot when more current is drawn from it. i have already used it. i think i limit the current on this module to 2A or 3A. thats why it is still working until today.
Hi Dear friend, I have a Dewalt 9.6V ni-cd battery drill and I´d like to upgrade the battery and Charger to a Lithium , I ear there for that It can to upgrade using 12V or 14.4V battery for my 9.V drill . Could you help me please ? Thank you for your great help
Its not safe to run a 9v battery to 12 or 14.4v. It could run a bit faster but might burn soon. U can try 3 lithium batteries in series at your own risk if you want.
@@CoachMBA I have a Bosch PSR 7.2 VES That has been converted to 3S Lithium.2 years down the line still running strong! I only use it for drilling plastics and fibreglass pcbs mind you.
With all the respect, but You should use always balancer to charge lithium battery. It can be easily done using BMS module installed inside your modified battery. In your case it would be at least 10Amps BMS. Very cheap on eBay. This will prevent damage or even fire of your battery. Thanks for the vid.
Just monitor individual cell voltage while bulk charging ensuring none exceed 4.2V.I have been using this method without the need for a BMS with no issues.
lithium battery have a typical battery voltage of 3.7 but at full charge they are 4.2 volt. so when we wanna charge a lithium battery. We need to charge it to 4.2 volt. for safety i charge it to only 4.1 volt. this pack had 4 batteries in series so i was charging it on 16.4 volt. 18 volt battery pack have 5 batteries in series. so i would set charging voltage to 4.1 * 5 = 20.5 volt. and again. i always attach the balancer to it while charging. REMEMBER. If a lithium battery is charged over 4.2v. it can explode.
Thanks for the video! Do I have to add a balancer if I add a BMS like this: www.ebay.com/itm/30A-4S-14-8V-16-8V-Li-ion-Lithium-18650-Battery-BMS-PCB-Protection-Board-Balance-/112262538826?hash=item1a235e664a:g:OXwAAOSwKVNYXT7v
Pablo MAYER FORCADELL ideally this should be the right way to install on of this in each battery pack. i tried these board. either they dont work or i always got faulty ones. i ended up exploding some batteries. so i dont trust them anymore. use them at your own risk. i use an external balancer. which i believe i showed in the video.
Hi, I am updating the batteries of my Bosch drill of 14.4 v and I would like to know if it is necessary the load balancer that shows in the video having an internal BSM in the batteries. Thanks for the input.
Please will someone explain to me why Diode is needed for and capacitor am I not familiar whit circuits. And Second; 2:47 diode polarity czcams.com/video/oAZOD3Ati84/video.html isn’t correct on shema as on video in czcams.com/video/oAZOD3Ati84/video.html 6:47. Am I wrong ? Thanks OK.... RTF :-) all clear but why 1000uF can be more ? or..
Nice project. The only thing I might say is you should set your voltage about 0.3V higher to account for the diode dropout voltage - what you are seeing on the display is output from VR - voltage drops as it goes through the diode so you won’t be able to fully charge the battery as you have it set up. 👍
I don’t know jack, but i love watchin this stuff.
I would be inclined to position the smoothing capacitor on the input of the DC - DC converter rather than stuck on the transformer to keep it away from the heat. This should extend the life of the electrolytic if it is kept cooler.
Thanks for your video. The solution you propose is not a convenient solution, where every month or so you use your Imax charger for balancing. Hobbyists can probably do it, but if the drill is used for work, it becomes impractical.
That's exactly what I was looking for, using the original charger.
thanks for sharing, Correct me if I'm wrong. I saw in the drawing and installation for the diod was different. On the drawing, the diod was on plus(+) side but on the regulator the diod was on the minus(-) side.
Install a BMS board into the battery pack. Enjoy
Thank you very much for your videos. You help me to understand few concepts with my old NiCd drill batery charger. And also with mi first time toenail fungus :-). My problem is i have a very good and strong bosch 24volt 1.5 A drill. The Nicd bateries (20s 1,2 v) are pretty dead, they take charge, not too much, but 1 min working they come off. Realy i use it only not so much, and i think that change to lion bateries, change the charger to make posible charging lion, find the balancer and do all the work, and buy all the material, is pretty to much for the use actually i do with. Instead i was thinking convert it to directly corded to AC, but it is no so easy to find at home a transformer from 230V AC to 24 30V DC and wich supplies minimum 10A. Also it exist the possibility of adapting a ATX Pc power supply, but i would like something that i can put inside the old bateries case. My cuestion if you can help me if it is posible to use a swichting power suply 230VAC TO 24VDV 6A like the one i put you in this link czcams.com/video/Cy8I4RfRlQg/video.html
That is able to connect directly to 230 AC and gives me the 24vDc and 6A max that i need instead of bateries. No transformer needed, no bateries needed, no balancing needed, no charger needed, and it is able to put inside the batery holder. Understanding that now i use the drill a couple of times a month.. Realy thank you for transmiting your abilities and i will tell you in a couole of months how my toenail goes..
I really liked and enjoyed this video, it is very practical and has lot of creativity in here, Genius work !
It would be cheaper to just use a an 1$ 3AMP module with CC CV with the transformer and at AC to DC or even the already DC output
Awesome video! Thank you! One question: what is the purpose of the diode between the buck converter and the load? Hasn't the current already been rectified?
Great job friend I appreciate it I've been wanting to do this myself and I happen to have all the stuff appreciate you. You also made it so easy.
You are welcome
Thank you for having posted this video
Alessandro Marzico
you are welcome.
Great job! And If I wanna use my original Bosch charger to charge upgraded Ni-Cd battery (with li-ion 18650 cells and BMS board inside) can I do the same upgrade with my charger as you in this video?
Thanks, nice, but lots of work for a charger. You can buy a Li-lion Lithium battery charger buck converter CC CV module with led light that turns red while charging and green when done. I think it will stop charging also to protect the li-ion battery from over charging (for less than $5). It also has adjustable voltage coming in and out so, you may still use the DC converter inside the unit. That was before the Corona virus that you can order thru ebay from China. BUT, building diy is more fun though.
Do you have a link for it?
hi ive ordered the parts off ebay for covert nicaad to 18650 charger im using samsung cells x10 plus bms 20v 5s2p probably be bigger case though.thanks for video.
Hi there, real nice tutorial and well build-ed , can i ask you, so far after a year and so did this charger still working,did you made any more mods on it? I am thinking of building one and i was wondering if you have made any better one .
yes. it is still working great
What is the circuit for a P119 small charger where 21 VDC is supplied. Maybe without the display ?
There are new bms on ali that balance batteries automatically!
Hello and great instructions on this conversion. I have a 18 volt dewalt charger that I would like to convert. When I opened it up there is only a very small transformer on the pcb. If I use a power supply that has a output of 24 volts DC do I still need to use the capacitor in your drawing? Thanks for a great video. Dennis Eller
deller73 did you solve your problem? I have 18volts too..
no then you don't need that capacitor. this capacitor is only needed when using a transformer and bridge rectifier.
DeWalts use a switchmode design. Do not mess around with them unless you know what you are doing!
Thank you for a great video. I subscribed !
you are welcome
In your circuit drawing, the diode connect to positive of output voltage regulator but in video, you have it connected to negative terminal. Which one is correct?
Hoang Nguyen
either way is fine
any which way is fine.
Thanks Tek geek, great video. can you use the battery tester to balance charge all the batteries at the same time? could you explain more?
actually i always attach the balancer while charging for safety.
yes i always connect the balancer while charging for safety. otherwise imbalanced batteries could explode while charging. which once happened with another charger that i made.
It's confusing me. Why in video description suggest to use 1000uf, 35V capacitor but in your circuit drawing you used 2200uf, 35V capacitor instead? Which 1 is correct or any explanation? Please advise,. especially author/owner.
The capacitor is used as a decoupling, so you can go higher in capacitance if you want, just respect the voltage and polarization.
In simple terms They are used in a reservoir fashion so the “size of the reservoir” doesn’t need to be precisely 1000 anything in the thousands should be good.
For voltage is recommended to always use a capacitor rated for twice the normal voltage.
Like on a 5v circuit you will find capacitors rated for 10v or 16v. For a 12v you could just use 24v capacitors but they don’t make 24v capacitors so the nearest value is 25v or even 50v is fine. Just have at least a minimum of 1.5X margin.
I do not speak English, using a Google translator. LOL
yO NO HABLA eSPANOL... mE eSPANOL ES UNA CAUSA DESESPERADA!... Una causa Perdida! ;-)
- El Canguro Australiano
In my country (Chile), is 220v AC, this plans work?
Yes it will be okay, because your transformer will be designed to reduce the voltage from 220v to 20v. So long as the secondary voltage of the transformer is lower than the maximum input voltage of the DC - DC converter it will be fine.
yes it will
Nice work!
Interesting video but your project lacks is a mechanism which cut off charging when the battery pack is full. Otherwise you have to supervise the charging process and remove the battery manually before it explodes
Is it the same parts for a Craftsman 19.2V ??
I want to make a dead 15.6v panasonic to li-ion, it is ni-mh, how many 18650 would i need and where could i get a battery protection circuit? Any ones on aliexpress etc all are 14.6v 18v 24v etc
Also, 220v
@@feboober 4S should do the job. (4.2x4=16.8)
Hi, excuse my intrusion however i was wondering if i could use an lm2596 power module for the conversion
lm2596 max current is 3A. there is no way to limit current. so it gets very hot when more current is drawn from it. i have already used it. i think i limit the current on this module to 2A or 3A. thats why it is still working until today.
please show me the R data? thank you
what are you talking about
thanks tek
Hi Dear friend, I have a Dewalt 9.6V ni-cd battery drill and I´d like to upgrade the battery and Charger to a Lithium , I ear there for that It can to upgrade using 12V or 14.4V battery for my 9.V drill . Could you help me please ? Thank you for your great help
Its not safe to run a 9v battery to 12 or 14.4v. It could run a bit faster but might burn soon. U can try 3 lithium batteries in series at your own risk if you want.
@@CoachMBA I have a Bosch PSR 7.2 VES That has been converted to 3S Lithium.2 years down the line still running strong! I only use it for drilling plastics and fibreglass pcbs mind you.
Hi tec geek please could you answer, are you using 1000uf 35v or 2200uf 35v in your circuit, I am confused
No need to be confused. It's just a smoothing capacitor.The capacitance is not critical
With all the respect, but You should use always balancer to charge lithium battery. It can be easily done using BMS module installed inside your modified battery. In your case it would be at least 10Amps BMS. Very cheap on eBay. This will prevent damage or even fire of your battery. Thanks for the vid.
i always put a balancer on the balancing port while charging.
i have used bms boards but after having the boards on. batteries still get imbalanced. so i don't trust them.
If you are observant enough you will notice a multi connector poking out of his battery case. ..Go figure.
Just monitor individual cell voltage while bulk charging ensuring none exceed 4.2V.I have been using this method without the need for a BMS with no issues.
Great job.
you are welcome
Very good video !!! Thank you!!! I have a question; For an 18v battery charger would the components be the same? One more time ...Thank you!!!
lithium battery have a typical battery voltage of 3.7 but at full charge they are 4.2 volt. so when we wanna charge a lithium battery. We need to charge it to 4.2 volt. for safety i charge it to only 4.1 volt. this pack had 4 batteries in series so i was charging it on 16.4 volt. 18 volt battery pack have 5 batteries in series. so i would set charging voltage to 4.1 * 5 = 20.5 volt.
and again. i always attach the balancer to it while charging.
REMEMBER. If a lithium battery is charged over 4.2v. it can explode.
Thanks for the video! Do I have to add a balancer if I add a BMS like this: www.ebay.com/itm/30A-4S-14-8V-16-8V-Li-ion-Lithium-18650-Battery-BMS-PCB-Protection-Board-Balance-/112262538826?hash=item1a235e664a:g:OXwAAOSwKVNYXT7v
Pablo MAYER FORCADELL
ideally this should be the right way to install on of this in each battery pack.
i tried these board. either they dont work or i always got faulty ones. i ended up exploding some batteries. so i dont trust them anymore. use them at your own risk.
i use an external balancer. which i believe i showed in the video.
yes, just set the output voltage to 20.5 volt
Is there a different between AC amp meter and DC amp meter?
theres no ac amp meter,only dc
Hi, I am updating the batteries of my Bosch drill of 14.4 v and I would like to know if it is necessary the load balancer that shows in the video having an internal BSM in the batteries. Thanks for the input.
bms board still imbalanced my batteries. saveral tries. so i don't trust mbs boards
as im uk 240v will the parts still work ok like rectifier ?
will work as long as u have 220 volt transformer
Please will someone explain to me why Diode is needed for and capacitor am I not familiar whit circuits.
And Second; 2:47 diode polarity czcams.com/video/oAZOD3Ati84/video.html isn’t correct on shema as on video in czcams.com/video/oAZOD3Ati84/video.html 6:47. Am I wrong ?
Thanks
OK.... RTF :-) all clear but why 1000uF can be more ? or..
can be from 470 and up,bigger is better but more expensive and not necesary
@@simpesfaip Thanks Vaat :-)
You dont want power from the battery to go backwards into the unit
Label both the charger and battery so someone doesnt die
Please can you translate your vidéos to french language.
Of course, you don't bother yourself to learn English, we'll translate the whole internet into French for just you.
Totally stupid to chop out all the internal parts, then replace them with equal parts you bought from Ebay.
Leave the fucking PCB IN THERE.