What you need to be careful of is the discharge rate, how many Amps will be drawn by the A-10's motors at full throttle. Most consumer-grade Lithium technology is not meant to sustain a discharge of several Amps. Twice their rated capacity in mAh is about all you can expect normally. I think the A-10 can draw upwards of 8 Amps.

Then there's that pesky safety circuit. Who knows what it does. It could cut the pack off if the current draw exceeds a certain amount, which leaves you with a dead plane and no control. Can you get a measurable voltage off two terminals on the pack?

Other factors not having anything to do with the technology itself might make this a deal breaker, though. Will the pack fit? How much does it weigh? The A-10 is not known for being overpowered, and anything you can do to lighten the load...