Power supply unit and portable apparatus using the same

Power system configuration

Power system configuration

Power tool and convertible remote battery pack therefor

Precision battery pack circuits

Programmable power supply system

Programmable wall switch plug-in timer

Rechargeable system with separate battery circuits in a common m

Releasably connecting power packs to electrical appliances

Semiconductor power pack

Single phase or three-phase field configurable power assembly

Space-saving back-up power supply

Supplying power for communications devices

Survival radio battery adapters

System using interchangeable nickel-based and lithium ion batter

Tamper proof safety circuit

Thin-film photovoltaic power element with integrated...

Uninterruptible power supply for a medical appliance

Universal energy pack