Yes you can tell when measuring each bank if they are similar level, most cases you can do that. I ran across some bms just won’t charge properly from half charged or some bank won’t get charged fully.
Yes. When charging you can measure each cell to see if it's balance charging on both the charger and from a power supply. I'm still working on getting this one to reset it's fault, I'm completely draining them then seeing if it was reset on the charger. I was able to reset one pack but this one is fighting me, but it's all part of the process of learning the tricks through trial and error
@@Paul-IE-Repairs Any tips for getting one of these to reset? I have a dead 4/8Ah Multivolt that I force charged off of a DeWalt battery. Each bank is reading about 15V now but it still blinks a fault. If I put it in my impact wrench it'll run the light and let me change the settings on the tool, so it seems to have charge but it "thinks" it's dead.
Thanks for doing the video. Not many on this battery. I’m trying to make an adapter to use this battery. What is the pin out for the contacts ? How do you get 36 v? I know it’s a series connection but which contacts provide that? Thanks
I'll have to review and see which wire you are talking about. There are several wires for monitoring the cell voltages as it discharges and charges, unfortunately not all cells are manufactured flawlessly and they die prematurely.
I don't think you show the LED status, I believe that once you get the 2 end LED's flashing the board is locked out and cannot be reset, even after balancing / repairing faulty cells...correct?
Ive been able to reset a few once they fault out. I havent had time to look into these further, hopefully soon i might be able to soak one and tear into it more
Have a couple questions you charge them but I really wish you could tell me which one side was what or how to figure it out. And how high to charge each bank. Also I've had a few of these that are giving me trouble is there a way to send it to you
Each battery is polarized with a positive and a negative end, they look just like a standard AA battery does. Each cell has a total capacity of 4.2v peak. When they are wired in a series of 5, you end up with 20v. They have two banks of 20v that can run in parallel or in series to make 40v, depending on what the tool demands.
@@midiadventure even on the lower bank of cells? Once they're all even again usually it will reset on the charger, if not drain then pack down and to about 3.3v per cell then put it on the charger
