| http://www.w3.org/ns/prov#value | - Most battery-operated electronic bric-a-brac these days includes some form of a switchmode power converter in order to draw constant power out of the battery and obtain maximum charge depletion.The other thing to consider is that a device which monitors source voltage would be detecting premature depletion if a poor contact was a problem, although the OP later clarified that the unit is not just c
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