ZKTOOL 12V Car ECU Emergency Power Supply Cable, Automotive Memory Saver with Buzzer Alarm, OBD II Plug, Cigar Lighter Socket, Memory Saver Connector, Battery Replacement Tool, Battery clip

Very simple to use and works well.

Car

I bought this because we needed to change the battery on a MK8 Honda Civic TypeS.It’s debatable that the car actually needed this battery backup while we changed the main battery - but it was the case that all the radio and alarm settings were in tact after the new battery was fitted.In essence I thought it was probably cheaper to buy this for a few pounds than run the risk of losing the setup data off the car and then trying to sort that out afterwards.Had I still had my Audi A6 I would definitely have needed it.