Are you using large cells or mini?
An 8.4v 5000mAh will do just fine. It will extend your play time dramatically over the 1200mAH.
A 9.6v will work if you have space and increase your ROF but understand that a low end AEG gearbox will wear faster due to the higher cycle frequency. You will also have a greater risk of destroying the switch assembly due to increased arcing.
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