Linked by Eugenia Loli-Queru on Mon 18th Jul 2005 03:38 UTC
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If it's SRAM and not DRAM, it can keep state on 1 micrwatt of power, which is miniscule for any battery. Memory can't be read on that power level, but it'll maintain its current state. So, as long as you have a battery, or even a capacitor large enough, it'll survive long enough to change batteries.