Gionee M7 Power has 5000 mAh big battery.
Yes, Gionee M7 Power is a metal body phone. It is made of series 6 Aluminum Alloy.
Yes, Gionee M7 Power does have the hybrid sim slots. You can either use 2 Sim cards or 1 sim card and 1 memory card.
Gionee M7 Power dimensions are as below: