Hi, I've got a really odd issue: I have 2 batteries for my Phantom 1, the stock DJI battery and an aftermarket 2500mAh battery. I bought the Phantom 1 and aftermarket battery about 6 months ago, so I guess the stock DJI battery could have sat in the box on a shelf a long time before I bought my Phantom. Anyway, if I fly the 2500 mAh, everything is normal. If I put in the stock battery, the motors won't spin up and I get 3 quick flashes of the green LED when I try to start the motors. The power up is normal for both batteries, meaning start up music, warm up, acquire satellites and flashing green. Clearly there is something about the stock battery that my Phantom doesn't like, but I've never heard of this before. I've got a "high end" charger (Hyperion EOS 0720i Super Duo) and there are no complaints from the charger, it charges/balances both batteries normally.

Any thoughts?

How about the aftermarket 2500mAh battery? Can you turn on the motors with this  battery?
Here is the suggestion,
1. Connect your Phantom to the Phantom assistant, check if any failure reminds