Lipo battery balance plug can sometimes be damaged by spinning propellers in flight. it’s extremely unsafe to use this LiPo with a broken balance lead as it can short itself easily and cause fire. In this article I will show you how I fixed mine.
What’s Balance Lead For?
The balance connector allows you to check the voltage of each cell in a LiPo battery. This is especially important for “balance charging”.
For more info about LiPo battery, check out my tutorial.
Here are examples of a 4S and a 2S LiPo batteries, how the balance lead is connected to each cell.
What to Do with Damaged Balance Lead?
If you have a damaged balance connector, you should first check the voltages of all the cells and make sure they are within safe range. A broken balance connector could get shorted and over-discharged. In which case you should decide whether you want to fix it, or just dispose it.
Here is how to dispose a LiPo battery safely.
If there is no sign of physical damage to the rest of the pack, and all the cells are fine, you can then proceed to fix or replace the broken balance connector.
Buy and Replace Balance Plug
Whenever you can, replace the broken balance plug with a new one.
Where to buy
All you have to do is to start with the lowest wire (ground – usually black) and work your way up to the highest that will give you the wire order they should be in.
Make sure you transfer from the old connector to the new ONE WIRE at a time. Otherwise it’s very easy to short two exposed wires. Put heatshrink tube in before moving to the next wire.
It’s unlikely, but if you do get confused about which wire/cell you are working on, just check with a multimeter. Put the multimeter on DC Volts, put one probe at the black wire in the XT60 discharge lead, and put the other probe at the wire you are working on. Each wire in the balance lead will give you a different voltage reading.
Balance Plug Protector
These “LiPo balance connector savers” exist for protecting your balance lead.
You can get them from:
They do provide protection to certain extent, but they don’t make your balance connector bullet proof. The exposed bit can still get damaged in some situations.
- Apr 2015 – Article Created
- Sep 2018 – Updated