Bionx battery without BMS cell replacement

Batteries, Chargers, and Battery Management Systems.
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obcd   100 W

100 W
Posts: 159
Joined: Jul 16 2019 3:45pm

Bionx battery without BMS cell replacement

Post by obcd » Apr 05 2020 4:30pm

I bought a cheap second hand bionx motor, display and battery. The battery cells are toast. The battery bms board is not having balance wires. It's an 11S 4P battery.
Does it make a difference if you create 4 strings of 11 batteries and connect those in parallel compared to the normal method of having 4 cells in parallel 11 times and connecting those in serie? If so, which method would be best to use without balancing and why?
Last edited by obcd on Apr 06 2020 3:09am, edited 1 time in total.

Corrida victim   10 mW

10 mW
Posts: 23
Joined: Feb 27 2020 8:45am

Re: Bionx battery without BMS cell replacement

Post by Corrida victim » Apr 05 2020 5:13pm

I would put a cheap bms in that battery. Bionx should've never put that to the market.

obcd   100 W

100 W
Posts: 159
Joined: Jul 16 2019 3:45pm

Re: Bionx battery without BMS cell replacement

Post by obcd » Apr 06 2020 3:07am

There is a BMS in the battery. It's just not blancing the cells.
It has an undervoltage cutoff and overvoltage charging cutoff as well. It also measures the temperature of the cells.
I read often about people using batteries without balancing.
Some cells seem to deal with it better than others.
Reading it back, the title is indeed a bit misleading. It should say 'without balancing BMS'

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