Issue: Poor battery life. Battery life for the iPhone 7, so your only decision was how much capacity to get and whether you wanted it with a darker black/gray or a lighter white/silver finish
The iPhone 7 battery will fit and work just fine in iPhone 6s. You only need to bend iPhone 7battery ribbon in s-shape (as I did) because it is longer then iPhone 6s ribbon. Make sure to use an original battery otherwise The benefit will be very subjective rendering the whole operation useless.
Retina HD display with 3D Touch. 4.7-inch (diagonal) widescreen LCD Multi-Touch display with IPS technology. 1334-by-750-pixel resolution at 326 ppi. 1400:1 contrast ratio (typical) 500 cd/m2 max brightness (typical) Full sRGB standard. Dual-domain pixels for wide viewing angles.
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battery capacity of iphone 7