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A battery-operated portable electronic device has a primary battery to provide energy to low current circuitry of the portable device, and a supplemental battery to provide intermittent bursts of energy to other components of the portable device. A charging device charges the supplemental battery fr

A battery-operated portable electronic device has a primary battery to provide energy to low current circuitry of the portable device, and a supplemental battery to provide intermittent bursts of energy to other components of the portable device. A charging device charges the supplemental battery from the primary battery. An electronic device employing the battery system may have a battery compartment for the primary battery, which can be an AAA, AA, C, or D size battery.

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What is claimed is: 1. A portable device that is battery operated and stores data for retrieval, the portable device comprising: a hard disk drive having a first data storage capacity and storing data in the portable device, a solid-state memory module having a second data storage capacity, smaller

What is claimed is: 1. A portable device that is battery operated and stores data for retrieval, the portable device comprising: a hard disk drive having a first data storage capacity and storing data in the portable device, a solid-state memory module having a second data storage capacity, smaller than the first data storage capacity, temporarily storing blocks of data being retrieved, an output module outputting the blocks of data temporarily stored by the solid-state memory module, a copy module intermittently copying blocks of data from the hard disk drive to the solid-state memory module to be output by the output module, a primary battery having a first energy storage capacity and providing energy directly to the solid-state memory module, a supplemental energy storage device having a second energy storage capacity and providing energy directly to the hard disk drive in intermittent periods when the blocks of data are being copied from the hard disk drive to the solid-state memory module, wherein the first energy storage capacity is larger than the second energy storage capacity, and a charger module charging the supplemental energy storage device, from the primary battery, when blocks of data are not being copied from the hard disk drive to the solid-memory state module by the copy module, wherein an electrical current supplied by the supplemental energy storage device to operate the hard disk drive intermittently is larger than a charging current supplied by the primary battery through the charger module to charge the supplemental energy storage device. 2. The portable device of claim 1 comprising a microprocessor including the output module and the copy module. 3. The portable device of claim 1 wherein the supplemental energy storage device is a super capacitor. 4. The portable device of claim 1 wherein the primary battery is selected from the group consisting of a rechargeable nickel-cadmium (NiCd) battery, a rechargeable nickel-metal-hydride (NiMH), and a rechargeable lithium-ion (Li-ion) battery. 5. The portable device of claim 1 wherein the primary battery is selected from the group consisting of a non-rechargeable carbon-zinc battery, a non-rechargeable zinc-chloride battery, and a non-rechargeable alkaline battery. 6. The portable device of claim 5 further comprising a battery compartment accessible by a user of the portable device for holding the primary battery, wherein the battery compartment is configured to receive a non-rechargeable battery to function as the primary battery. 7. The portable device of claim 1 which is a portable media player. 8. The portable device of claim 1 wherein the charger module charges the supplemental energy storage device only when the hard disk drive is not operating, between periods when blocks of data are being copied from the hard disk drive. 9. The portable device of claim 1 wherein the primary battery does not provide energy directly to the hard disk drive and the supplemental energy storage device does not provide energy directly to the solid-state memory module. 10. A portable media player comprising: a hard disk drive having a first data storage capacity and storing media data in the media player, a solid-state memory module having a second data storage capacity, smaller than the first data storage capacity, temporarily storing blocks of media data, a player module for playback of the blocks of media data temporarily stored by the solid-state memory module, a copy module intermittently copying blocks of media data from the hard disk drive to the solid-state memory module during the playback, a primary battery having a first energy storage capacity and providing energy directly to the solid state memory, a supplemental energy storage device having a second energy storage capacity and providing energy directly to the hard disk drive in intermittent periods when the blocks of media data are being copied from the hard disk drive to the solid-state memory module, wherein the first energy storage capacity is larger than the second energy storage capacity, and a charger module for charging the supplemental energy storage device, from the primary battery, when blocks of media data are not being copied from the hard disk drive to the solid-state memory module by the copy module, wherein an electrical current supplied by the supplemental energy storage device to operate the hard disk drive intermittently is larger than a charging current supplied by the primary battery through the charger module to charge the supplemental energy storage device. 11. The media player of claim 10 wherein the charger module charges the supplemental energy storage device only when the hard disk drive is not operating, between periods when blocks of data are being copied from the hard disk drive. 12. The media player of claim 10 wherein the primary battery does not provide energy directly to the hard disk drive and the supplemental energy storage device does not provide energy directly to the solid-state memory module. 13. A portable device that is battery operated, comprising: a hard disk drive storing data in the portable device and having a first data storage capacity, a solid-state memory module having a second data storage capacity, smaller than the first data storage capacity, temporarily storing blocks of data being retrieved, a primary battery providing energy directly to the solid-state memory device, the primary battery having a first energy storage capacity, a supplemental energy storage device providing energy directly to the hard disk drive only during operation of the hard disk drive, the supplemental energy storage device having a second energy storage capacity smaller than the first energy storage capacity, and a charger supplying energy from the primary battery to the supplemental energy storage device only during periods when the supplemental energy storage device is not providing energy to the hard disk drive, wherein an electrical current supplied by the supplemental energy storage device to operate the hard disk drive intermittently is larger than a charging current supplied by the primary battery through the charger to charge the supplemental energy storage device. 14. The portable device of claim 13 wherein the primary battery does not provide energy directly to the hard disk drive and the supplemental energy storage device does not provide energy directly to the solid-state memory module.