Originally Posted by mark_q
Your batteries are likely done.
When Lipos get tired their capacity drops pretty quickly. I've got a pile of 2200 30C GA packs that last about 5 minutues on my Sniper (3D foamy). A new 30C SkyLipo goes a solid 9 minutes. The GA packs have somewhere between 150 and 200 cycles on them which for me is a pretty normal life. I balance charge 100% of the time and never above 1C. When they get this bad, I wire 4 or 5 five of them together in parallel and power my FPV base station.
I left those 2 GEN ACE fully charged for more than 6 months without using it during the winter season, would that be enough to kill it?