Battery warm to the touch

LordP · Aug 8, 2017

Hi,

I'm pretty new here, and to drones in general, but did a search for "Hot Battery" but I think my situation is a bit different.

I have the Spark & 2x batteries in the original foam box it was shipped in, and I have the "Fly More" package + two spare batteries in the little carry bag that came with the package.

I have not used the Spark in a week (my one and only time so far) and I charged all four batteries at that time - a week ago.

Today I finally received the Fheaven carry case and decided to transfer everything to this case.

All four batteries were warm to the touch even though I keep all the parts in an Air Conditioned bedroom.

Surely this can't be normal...can it?

msinger · Aug 8, 2017

It's perfectly normal if you haven't touched the batteries. They are probably auto discharging down to the storage level.

LordP · Aug 8, 2017

Thanks for the super quick reply....and for the relief you just provided.

It seems an odd thing that they would need to "auto discharge" but then again I know zero about these batteries.

I have a couple of questions if you don't mind.

Do you know what the storage level is as a % of full capacity?

Should I not bother charging the batteries after a flying session?

msinger · Aug 8, 2017

LordP said:
It seems an odd thing that they would need to "auto discharge" but then again I know zero about these batteries.

In the Spark Battery Safety Guidelines, DJI recommends storing batteries between 40%-65% charged. You could really go down to even around 30% without harming them. Storing DJI batteries at 100% charged for long periods of time will decrease their life. That's why they are set to start auto discharge down to about 60% after 10 days (as long as they are not used and you don't press the battery button). The discharge process can take up to ~2 days to complete if the battery is fully charged.