My Spark has been idle since August and when I tried to power  up yesterday it wouldn’t. I tried all three batteries.

you should tell us more about circumstances, that followed by this situation. Without any additional facts, we can't help you.

Not to be funny but since it's been a while you may have forgotten....when powering on the batteries, did you do the double-press where you press the first time quickly, then the 2nd time and hold it until it powers on?

Hi, we're sorry for the inconvenience. Have you tried to power it on by pressing the power button twice? Press and Press and hold for 1-3 seconds. If yes, would it be possible if you could show us a sample video of the issue so we can check it on our end? Thank you.

DJI Natalia Posted at 1-7 08:14
Hi, we're sorry for the inconvenience. Have you tried to power it on by pressing the power button twice? Press and Press and hold for 1-3 seconds. If yes, would it be possible if you could show us a sample video of the issue so we can check it on our end? Thank you.

I'll try that.  Thanks

Yukon 3-0268 Posted at 1-7 12:07
I'll try that.  Thanks

No worries, please keep us posted for further help. Thank you.

Are the batteries fully charged?

I'm sure you would be aware of this, but just to be sure, the batteries in the Spark discharge themselves if left idle for a week. So, did you charge them or rely on them still being charged.
I hope you get back in the air soon.

I read they go into hibernation mode after a certain period of time and like when new, you have to put them on the charger to wake them up.

Sleeping batteries need recharge.
Just hooe, that the long sleep did not harm them.
DJI suggest, to recharge , weak up the batteries every 3 month

After (default) 10 days, the battery will discharge. That's why it's called a smart battery. You may be able to change this within the DJI GO app. Unless you recharge & still have a failed result - reply again.

DJI Natalia Posted at 1-7 12:24
No worries, please keep us posted for further help. Thank you.

I had forgotten to press once and then hold

Sparkz71 Posted at 1-8 00:09
After (default) 10 days, the battery will discharge. That's why it's called a smart battery. You may be able to change this within the DJI GO app. Unless you recharge & still have a failed result - reply again.

I had forgotten to press once and then hold

Sparkz71 Posted at 1-8 00:09
After (default) 10 days, the battery will discharge. That's why it's called a smart battery. You may be able to change this within the DJI GO app. Unless you recharge & still have a failed result - reply again.

I had forgotten to press once and then hold

Sparkz71 Posted at 1-8 00:09
After (default) 10 days, the battery will discharge. That's why it's called a smart battery. You may be able to change this within the DJI GO app. Unless you recharge & still have a failed result - reply again.

I had forgotten to press once and then hold

Sparkz71 Posted at 1-8 00:09
After (default) 10 days, the battery will discharge. That's why it's called a smart battery. You may be able to change this within the DJI GO app. Unless you recharge & still have a failed result - reply again.

I had forgotten to press once and then hold

S-e-ven Posted at 1-7 15:25
Sleeping batteries need recharge.
Just hooe, that the long sleep did not harm them.
DJI suggest, to recharge , weak up the batteries every 3 month

I had forgotten to press once and then hold

I had forgotten to press once and then hold

Yukon 3-0268 Posted at 1-8 10:10
I had forgotten to press once and then hold

Silly mistake. Thanks for the honest reply.. I hope you are now flying?