Battery broken cell and what to do with the other one?

I assume that there's no problem by using the batteries mixed.That is why the I2 is designed with 2 batteries as far as I know.
To avoid future problems just charge and check batteries even when not flying.That's what I do in the winter when flying is less regular.
So next time keep an eye on your batteries ,saves you a lot of money

Hi SMD, five cents worth - Is it not a case of an upgrade required on the battery firmware perhaps? - there was a lot of talk about battery dead cells that got fixed by the latest upgrade - I personally had one that was manufactured almost a year ago so it had been sitting on the shelf for some time - second time I charged it it had a "broken cell" - which got fixed after full craft firmware upgrade using DJI assistant 2 downloaded from the I2 DJI support website ( you must be logged in to see the downloads). Must add there is some sequence like upgrade, charge and let it sit for some hours - I think it was 90 or 72.

I have 4 out of 10 battery´s with broken cells and only 7-9 cycles on them..

Lots of talk here and on DJI forums about that - maybe you can revive some of them with the upgrade - see this post
Inspire 2 Battery error
Discussion in 'Inspire 2 Help' started by Waynequilliam, May 7, 2018.