I received a cheap extended life battery for my wife’s galaxy s5 from Amazon several days ago. It was coming with around 50% battery life so we let it fully charging then playing on it. We had originally been intended to have one off Mpj but since we have $10 Amazon coupon thats expiring soon, so why not? However so far we can’t see any improve yet, I'll post another set later. Wishing this is not a defective battery.