eVU - 20+ Hours of batter time...

''Control circuitry is provided to enhance power conservation and to more effectively control allocation of voltage levels to circuitry components in accordance with specific power needs. The control circuitry includes embedded software commands for disabling certain circuitry components when not needed, as well as trigger commands to restore power for rapid response of disabled circuits.''

http://www.patentstorm.us/patents/5491774/description.html

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