Hello all,

I have an 11.1 V 1800 mAh battery for an airplane that is reaching the end of its life. As a replacement, I have two other batteries just lying around that Im considering connecting in parallel as a replacement. The replacement batteries are both Electrifly 15C, one is an 11.1V 650 mAh and the other is an 11.1V 1250 mAh.

My question is this: Can you run 2 batteries with the same V, but different mAh in parallel?

The motor Im using is pulling 9 amps max. If the batteries are in parallel, will the motor try to pull the same current from each battery, or will it pull an average: more from the bigger battery and less from the smaller battery?

Running the batteries like this seems rather logical to me, but something in the back of my head tells me that this could be dangerous.

Any help would be appreciated.

Thanks,

Brady