Ok been using the ravpower for a bit now, the acevan seems to last longer. Acevan came with instructions to drain and fully charge at least 3 times which I did. Ravpower didn't come with any instructions. Acevan no nfc, ravpower does have nfc.I just ordered another battery from Ravpower this one has integrated nfc support and free shipping https://forums.androidcentral.com/e...ement-battery-for-samsung.html&token=w5SRijL8. From what I've read online ravpower has a pretty decent battery.