<p>The invention is for a portable power supply system (10) that provides power at voltages and currents suitable for running and charging electronic equipment. The portable power supply system (10) comprises a base casing (12) and a top casing (14) which fits on the base casing (12). A rechargeable battery (118) is contained in the base casing (12) and circuitry is provided for supplying power for charging the battery (118). The circuitry includes a power output connector means (34) on the top surface of the base casing (12) that is connected to the battery (118), and an electrical connection means (70) on the underside of the top casing (14) that is located so as to mate with the power output connector means (34) of the base casing (12) when the top casing (14) is placed on the base casing (12). The top casing (14) has plug pin holes (50) into which power leads of portable electronic equipment such as laptop computers and cellular telephones can be inserted.</p>
