Gionee A1 Plus weight is 226 grams. It is mostly because of it's huge 6-Inch display size and humoungous 4550 mAh battery.
Yes, Gionee A1 Plus does support OTG.
Yes, Gionee A1 Plus does have the front camera LED flash.
Gionee A1 Plus is a fully metal body phone and it does support fast charging, too. Besides, it has huge 4550 mAh battery. So, you may notice a minor heat issue while charging the same but otherwise there were no heat issues reported during our review.