Unknown wires in battery array

Thread Starter


Joined Oct 24, 2020
Hi, i have some rechargable batteries that currently make 11.1V in series i wanna make it 18V ish but there is a blue and white wire that goes between each battery. I'm not sure what they do. the part that would normally go the the device is just the red and black the extra wires are for the charging.

Can anyone tell me what these blue and white cables do?

and If i were to attach 2 extra batteries on the end with what would happen?



Joined Jun 22, 2012
It's for battery balancing during charging, you can add extra cells to make it upto 18V , but you need a 5 cell balancing PCB ideally for charging.