Computer-implemented managing of battery capacity within a battery system is provided. The managing includes obtaining, by one or more processors, data representative of a number (N) of battery packs in the battery system, and ascertaining, by the processor(s), a battery pack self-discharge time interval (TD) from full-charge to a partially discharged threshold for initiating top-off charging. The managing also includes determining, by the processor(s), a charge-staggering time interval (TS) using the number (N) of battery packs in the battery system and the ascertained battery pack self-discharge time interval (TD), and staggering, by the processor(s), top-off charging of the battery packs of the N battery packs in the battery system using, at least in part, the charge-staggering time interval (TS).