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Hello my name is Cris, I got a second hand S6 and the bettery is draining suspiciously fast. I was considering the idea of buying and putting the battery of a Galaxy S6 Active into this Galaxy S6. The spec and sizes of the batteries are the following: S6A capacity 3500 mAh / 13.48Wh volts: 3.85VDC size: 92 x42x5(mm) (long/wide/thick) S6 capacity 2550 mAh / 9.82Wh volts: 3.85VDC size: 96 x 45 x 4 (mm) So the battery from the S6 Active is shorter by 4 mm, narrower by 3mm and thicker by 1mm. Image of batteries: https://imgur.com/a/Rfvn96M

What do you think? Would it work and last longer? Has this been done by anybody? I googled a lot but dont find any content about this. Thank you

I am too unsure if a S6 Active Battery will perform better but I am certain that iFixit has the best batteries in town. Try one from them: Galaxy S6 Battery