They make a cigerette plug in with a 9 volt battery attached to it, to keep the radio alive while changing battery. Or you may be able to use a good battery with jumper cables attached to your car battery cables when you remove them, and keep 12 volts going while changing battery.
You need to keep a supply to it. You can buy various devices that plug into your cigar lighter. The quite simply have one of these square 9 volt radio type batteries in them. This keeps power on while changing battery. You could easily make something up with one of these batteries and a couple of leads going to the terminals after loosening the bolts. Be careful though and make sure your wires are secure so the do not come off while wrestling with the battery.
Cheers John
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Are U able to make a small simple electrical device?
after changing the battery the car won't start
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