Thanks to fast charging support, it takes about 2 hours time to fully charge Gionee M7 Power's huge 5000 mAh battery - from zero to 100%.
No. You cannot record 4K videos but you can record full HD videos with Gionee M7 Power.
Yes, Gionee M7 Power is a metal body phone. It is made of series 6 Aluminum Alloy.
Yes, Gionee M7 Power does have the OTG support.