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Old 02-06-2018, 03:41 PM   #9 (permalink)
gone-ot walking...
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Small, super-powerful, 12Vdc Li-ion battery inside a simple, old-fashioned, IGNITION KEY; just plug it IN to "start" the 12Vdc electronics.
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freebeard (02-06-2018), niky (02-12-2018), redpoint5 (02-06-2018)