[Mike I]

Has anyone used one of these or got any commnets to make. It's a device you plug into your cigar lighter in your car and saves your stereo/alarm/clock losing it's settings when you disconnect the battery (to do something electrical on your car)?

Do they work?

 

[Tom Williams]

what it probably does it to sense when the voltage drops below say 8 volts and then bumps up the volts for a period of time to stop the settings being lost, therefore injectiong 12 v into the lighter to keep the power up

 

[RickV6]

Think ya have to leave ignition on when using cos cig socket is only live when on!

 

[Trevor]

Just buy a sealed lead acid 12v house alarm battery, bout £10 and solder on some 40amp wire and battery clips. Put a 30amp inline fuse on the positive wire. Saves all the settings and you don't have to worry about it going flat because you don't need the ignition on.