Hello, i have 3 Spark batteries that haven't been used in probably a year or so. They will not charge now and the charging bank flashes green 3-4 times then goes solid red.  Any ideas? Are they toast?

HI there. Thank you for reaching out and we're sorry for the trouble that this has caused. Can you please try to leave the said battery one by one on the charger for approximately 3-4 hours and check if the issue persists? Please keep us posted. Thank you.

DJI Paladin Posted at 6-18 23:21
HI there. Thank you for reaching out and we're sorry for the trouble that this has caused. Can you please try to leave the said battery one by one on the charger for approximately 3-4 hours and check if the issue persists? Please keep us posted. Thank you.

I will try it out when i get home. Originally got it out to take on vacation, when it wouldnt work it got left behind

I do remember that Dji’s batteries after no use will enter hibernation mode if I am not mistaken. So I think trying what Dji Paladin said will work.

kobrien7 Posted at 6-19 12:53
I will try it out when i get home. Originally got it out to take on vacation, when it wouldnt work it got left behind

We do apologize again for the trouble. Please keep us posted after the test. Thank you and have a safe vacation, kobrien.

DJI Paladin Posted at 6-25 02:07
We do apologize again for the trouble. Please keep us posted after the test. Thank you and have a safe vacation, kobrien.

Hi, i have tried 2 of the 3. 1 over night and 1 all day today and just get a solid red light.  Any other ideas or tips? Thanks.

kobrien7 Posted at 6-27 12:35
Hi, i have tried 2 of the 3. 1 over night and 1 all day today and just get a solid red light.  Any other ideas or tips? Thanks.

I don't know if it helps, but it is worth a try:
Put one the failed batteries in your Spark and connect a 5 volts USB power supply capable of at least 2 amps to it. Wait several hours.
Let us know if that works out for you!

Cheers,
Wolferl

It's simply because they've been laying dormant for so long, all you need to do is warm the batteries up. Doesn't have to be conventional (the method you use).