[jmatta]

I wouldn't recommend disconnecting the battery; put a maintainer on it instead. The reason is that the engine control unit will forget everything it has adapted and go back to default. It takes about 150-200 miles of driving in various conditions to remap and get all systems "ready" (can impact emissions testing).

Maintainers are inexpensive and easy to use. Otherwise, GTA_G20 covered the basics.