A pulse width modulated battery charging system that applies constant current at a set voltage acceptable to the battery under charge and applied by a 90% duty cycle pulse until approximately two thirds of a full battery condition is reached, followed by gradually diminishing pulse width to 10% of said current and voltage as full charge is approached, and terminated when full charge is reached, and characterized by sensing battery condition during dwell between pulse charges and increasing the dwell for battery recovery from the affects of previous pulse charges.