The loss of power that occurs when you change your vehicle’s battery might reset its systems back to factory state, so you have to drive the damn thing 50 miles to get it running correctly again. Worse yet, you could lose all your radio presets.
Before you disconnect you battery, plug the Auto Memory Saver from EZ-Red into your OBD2 port. It uses the port’s power and ground pins to supply juice to critical systems so they don’t forget their settings. The neon-red coiled cord reaches 8′, has its own inline fuse, and terminates in a cigarette lighter connector. Obviously you’ll need to plug the cable into another power source while the vehicle’s battery is disconnected.
Just in case you don’t know any better, do not use cables of this type to jump-start a vehicle. The best thing that could happen is you’d blow the inline fuse — if the cable has one. Pricing for the Auto Memory saver starts around $15.