Battery pack

A battery pack (100) comprising a rechargeable battery (105) connected between first and second terminals (P, P), wherein the first and second terminals (P1, P2) are connected to a starter motor (220) and a generating module (210); and a charge limiting device (153) connected in a charging path of the battery (105) between the first terminal (P) and the battery (105), wherein the charge limiting device (153) is configured to control charging power to the battery (105) to prevent over-charging of the battery(105).