What happens when the internal battery is dead and you lost your master key to open your electronic safe? Crap happens that's what! To negate such evil I install an external battery to allow rapid changeout when they are depleted. Drill hole and mount battery holder. I used my drill to make a h...By: Mjhobby
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from Instructables: exploring - technology - robots http://ift.tt/1DEYNnn
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