Abstract: A battery charging method and system with a temperature-compensated charge profile requires that, during a ‘bulk stage’, a regulated constant charge current is provided to the battery until the voltage across it increases to a predetermined ‘absorption stage voltage limit’, at which time charging transitions to an ‘absorption stage’. During the absorption stage, a charge current is provided which maintains the voltage across the battery at the absorption stage voltage limit, until: 1) the charge current falls to a predetermined current threshold, 2) the charge delivered to the battery during the absorption stage reaches a predetermined charge threshold, or 3) the difference in charge between two successive intervals of equal duration becomes zero, at which time charging transitions to a ‘float stage’. During the ‘float stage’, a regulated constant charge current is provided, such that the voltage across the battery varies with the temperature of the battery.

Abstract: A battery charging method and system with a temperature-compensated charge profile requires that, during a ‘bulk stage’, a regulated constant charge current is provided to the battery until the voltage across it increases to a predetermined ‘absorption stage voltage limit’, at which time charging transitions to an ‘absorption stage’. During the absorption stage, a charge current is provided which maintains the voltage across the battery at the absorption stage voltage limit, until: 1) the charge current falls to a predetermined current threshold, 2) the charge delivered to the battery during the absorption stage reaches a predetermined charge threshold, or 3) the difference in charge between two successive intervals of equal duration becomes zero, at which time charging transitions to a ‘float stage’. During the ‘float stage’, a regulated constant charge current is provided, such that the voltage across the battery varies with the temperature of the battery.