US Patent 10207663 Battery power management apparatus and method

An apparatus, including a first battery capable of providing electrical power to a first load of a vehicle, premises, or article, at a selected time, and which does not draw current when a system is not operating; a second battery capable of providing electrical power to a second load, which second load draws current when the system is not operating; a first switch capable of disconnecting the first battery from a first circuit containing the system; a second switch capable of connecting the first battery to the first circuit containing the system and is capable of connecting the first battery to a second circuit containing the first load; and a battery recharger which recharges both the first battery and second battery simultaneously when the system is operating. The second battery provides electrical power to the second load when the battery recharger ceases to operate.