At my side business if we need to disconnect the battery I have made up a small box that holds a nine volt battery. Connected to the box is a cigarette lighter accessory cord. We plug the box via the accessory cord into the cigarette lighter and the nine volts holds the vehicle computer, radio and accessory device needs until we replace or reconnect the battery.
I built mine but I have seen the same device available in many auto parts stores for about ten bucks.
Handy little tool to have!
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