Hello, everyone, I am looking for a power bank since my iphone was always dead which lead me lose contact with my friends. On the other hand, i have many rather resource-intensive digital devices which the battery life will be worth much, well, the thing is, i am wondering if there are some power banks which accept different battery cells replaced like 1 cell, 2 cell, 3 cell so i can decide tby mairaliang13 - Off-Topic