Accidentally overcharged a lipo to 4.4volts/cell. What to do?

[Lennart]

The charger issued a connection error on channel A when I came back. So could have been a dirty balance plug, at least that's what I read on a different thread.

Well the charger decided to charge to almost 4.4 volts. The B channel had the correct 4.17volts just like I wanted.

I immediately discharged the lipo with the RC car. So the battery was 30-60minutes above 4.2 volts.

Is that lipo save to keep? No swelling yet. I recharged it properly and drove the car a little on 8s and everything looked normal.

 

[Neelis]

https://electronics.stackexchange.com/questions/317717/how-much-can-i-overcharge-a-4-35v-lipo

Quote:
So, overcharging of 150 mV over the nominal 4.2 V leads to about 10% more capacity for first 50-100 cycles, but the service life shrinks from 500-1000 cycles to about 200. Extrapolating, the another 100 mV will result in maybe 30-50 cycles life. This means that 50 mV over the spec won't kill the battery.

I wouldnt worry, but that cell took a beating on terms of cycles.

 

[Big Kid]

Just watch out for the pack "PUFFING / SWELLING" If the dimensions of the pack start changing with future charge cycles ... replace it and quit using.

IMO ...

 

[Yonic]

I wouldnt worry if it was charged like that for just an hour. just keep an eye on that lipo from now on, and make sure it doesn't happen again

 

[Lennart]

@Neelis it's a normal 4.2v battery. So 200mv difference .

I will store this battery at a different place and monitor it's IR.

 

[jkflow]

Bring it back to a safer level ASAP i.e. use it. Move on with life, maybe took 5% of lifetime life out of it but ok to use.
Around 4.5 - 4.6V they will catch fire and you'd be posting a 'burned down house' picture.
Watch them!

 

[Johnny b]

Put batteries in storage mode, list all RC items on book face and leave the hobby forever....your welcome.

 

[Lennart]

Put batteries in storage mode, list all RC items on book face and leave the hobby forever....your welcome.

Seems reasonable