Balancing a Ebike battery with a RC Charger 

THis is a great video. I like the harness. Most ebike batteries seem to come with the smaller JST (PH 2.0?) connectors which are different than RC JST HX 2.54 connectors.

I loved your idea of spoofing the RC charger into thinking it had its bulk power cables connected by jumpering to the balance lead's lowest and highest voltage wires. This setup makes it easy to plug in your balance connector anywhere in the series string and balance the covered groups. Many batteries are built with thin balance leads that wouldn't be able to handle much current. It is important to mention that the charge current while balancing needs to be limited so as not to burn up puny balance wires or in your case the internal traces of your voltage monitor which is being used as a makeshift breakout board.

Holy crap this is what ive been looking for a way to balance a pack thats dead or supposed to be dead because 1 pack of battery drop under the voltage rendering a complete pack van useles im happy with this video this is everything u need to determine if a pack is good a bms is bad ❤❤

For anyone thinking of doing this with a LiFePO4 battery, remember the flat curve of the voltage between 3.00 and 3.30 means you have to top or bottom balance. Can't play around in the middle and actually get the energy in the cells to be equal

there is BMS with balancing and BMS without balancing and usually they balance at the end of the charging i hope this helps

Thanks. I have a severely out of balance 42V battery.

Thanks for posting this video. With battery replacements so expensive, it is very useful to know that they can be revived. (Though it looks like I'll have to spend a bit to get the kit to enable that.)

the higher voltage batteries are in better condition or are the lower voltage cells are the better ones ?? i have a bms with 4 groups having lower voltage than the rest of the pack...anyone ??

This may be a dumb question but what are those connectors called?

bought m9 balancer charger .. hope it does faster!!!!

Hello I have question about an other video. If I have the Bafang BBS01 250W it's a version limited to 25km/h, can I unbridle it to go beyond that?

Could a battery pack be balanced just by connecting high voltage battery string via wire in parallel to low voltage sting until the equalize? Doing this manually over and over with the different strings until they are all equalized just using 2wires and a multi-meter?

I can't understand why the bike manufacturer doesn't provide a charger that balances the cells. Obviously it would cost a little more, but my first ebike battery is kapoot after just 6 months. First ride, it lasted pretty good. But every ride after that one it's gotten less and less range. Now I have to crack it open and buy these tools to fix something that shouldn't even be a problem to start with. They probably make more money selling replacement batteries, and just balance/recondition the batteries that go bad, and re-sell them.

I've just ordered my first electric bike(a recumbent trike actually) and this is exactly what I needed to see. I have an old iCharger 208B that I use to balance my Dewalt batteries with now. I use to fly RC helicopters a long time ago(before the age of drones and autopilots). What is the pin type for making the balance leads? All my stuff is JST-XH, but I can't really tell what that balance tester uses(I just ordered one). Thanks for the great video and help.

One thing though, didn't the cells get out of balance because some are more worn out than others in the 1st place? How long do you think till they get outta balance again? 🤔

If the Bms allowed the battery to become unbalanced, would it not happen again ? Did the battery perform ok after balancing with the hobby charger ? Are those connectors readily available, should I want to use that monitor ?

Confusing 😊

Could you not just use the charger without needing the $70. monitor ? It seems the only advantage of the monitor is seeing all 13 cell groups at once. Can't you just move the charger to the first 8 cell groups (1-8) then move it to cell groups (6-13) ? Since groups 6-8 have been already balanced then 9-13 would be balanced to match them right ?

How often will you have to balance it out like this ?

LG M26....no surprise there...those cells are known to not last

Have you thought about fitting a bluetootrh BMS, so that you can keep an eye on the health of the battery

Ok now do a video with a solution for someone with no skills or equipment.

Continue buying chiensia crap batteries and skimp on custom build with genuine batteries...