A charger

A charger (200) comprises a current input connector (203); a current output connector (201); means (207) for transforming an input current received through the current input connector (203) to an output current and passing it to the current output connector (201) further comprising a primary inductance (213) and a secondary inductance (211); and adjustable means (205) for changing the relative position between the current output connector (201) and the current input connector (203) by moving the primary inductance (213) or secondary inductance (211).