Is there any way to repair a bad cell on my P4P battery? One of the cells is reporting under voltage. I tried to drain the battery down to 5% as per instruction on the DJI Go app, but after I recharged the battery fully one its level indicator flashes meaning the cell number 2 is still bad. Should I just toss it?

Maxi3D please wait for moderators answer

Hi, thanks for the inquiry. The batteries of the drone have a 6 months warranty and Charge Cycle less than 200 Times, if your battery is not longer than 6 months then you can contact our support for further help. Please see the link below for reference.

www.dji.com/support

Thanks for your help, everyone! Unfortunately, my battery is out of warranty now as it is over a year old. Maybe I didn't use it much cause the bad cell?

I would toss it before your drone falls, batteries are much less expensive than replacing everything.

Maxi3D Posted at 2018-10-22 10:21
Thanks for your help, everyone! Unfortunately, my battery is out of warranty now as it is over a year old. Maybe I didn't use it much cause the bad cell?

If you have a bad cell in the battery i would simply replace it. Certainly do not ever fly with that battery you could if you wish use it for doing bench testing or setting up the drone prior to a flight.
You cannot recover a bad cell in the battery

Thanks for the advice! I will just recycle the battery. I don't want it to fail on me while updating the firmware too if I don't use it for flight.

Maxi3D Posted at 2018-10-22 13:21
Thanks for the advice! I will just recycle the battery. I don't want it to fail on me while updating the firmware too if I don't use it for flight.

Good choice !!