Was that other battery you tested known to work in another phone? If not the problem may be with each battery's on-board Battery Protection Board, not your phone.
+
Was that other battery you tested known to work in another phone? If not the problem may be with each battery's on-board Battery Protection Board, not your phone. Try a new battery or a known working one, hopefully that will fix it.
Was that other battery you tested known to work in another phone? If not the problem may be with each battery's on-board Battery Protection Board, not your phone.