Did I get a cheap batterie?
I bought a used 5c off ebay. Ad says won't turn on. After putting the battery in another 5c, got it charged and put it back. It has 3 x's on top of it. Ebay phone powered on but would go down 1% a minute or so. New ebay battery and same thing. Would this be an issue with the batteries or the u2 ic? If the battery, how much better are the ifixit batteries compared to ebay batteries?