Maybe not all but a lot suffer from problems. is this your first ebike , there are plenty of other ebikes at lower prices giving better value than this bike
is the battery on or off the bike im asking because i had a similar problem and found that after several trys the battery would charge but only on the bike
recelling the battery with upgraded cells is not very cheap either i was quoted 245 for the standard batteries (equivalent to whats in the case already) and 295 for upgraded cells which increase the range significantly