Keypad battery expanded, ripped off the dc charger

I noticed today the keypad is offline. I went to check and it turned out that the battery is extremely expanded and it pushes the case, which ripped off the micro usb connector. That the reason why the keypad is offline, since there is no charger. The product was bought one and a half years ago, so it is out of warranty. Anyone knows how to deal with that. So surprised to me that the battery can only last 1.5 years, and it went that bad.