Systems and methods for maintaining battery health

A method of maintaining a rechargeable battery pack having a plurality of rechargeable batteries. The method includes measuring charge-level for the rechargeable batteries; and selecting a first battery set including a donor battery having a high charge-level, and a recipient battery having a low charge-level that is less than the high charge-level of the donor battery. The method also includes: rebalancing the first battery set; measuring a rest profile of the recipient battery after rebalancing the first battery set; and determining battery health of the recipient battery based on at least the rest profile.