A battery charging regulator for use with a charger. The regulator comprises a switch element coupled to a control-circuit and to an adjuster-circuit. The switch element is adapted to selectively couple an input provided by a DC-DC converter with an output for a battery. The switch element comprises a control terminal and first and second path terminals located at a first and a second end of a conductive path respectively. The control-circuit is adapted to adjust an input to the control terminal to regulate at least one of a charge current and a charge voltage supplied to the battery via the conductive path. The adjuster-circuit is adapted to sense an electrical parameter of the switch element; and to adjust a value of the input provided by the DC-DC converter based on the sensed electrical parameter value.