Dont Disconnect Your Car Battery
There is a common misconception that you can save the car battery by unplugging the cord when you are not driving the car for weeks. But, it won’t help much instead it can create problems. Newer cars require constant battery power for the Keep Alive Memory (KAM). This is something called a parasitic load on the battery due to clock memory, ECM, etc, but in most cases, this takes months to completely drain a battery Once power is lost for more than 10 to 20 seconds, the cars ECM may have to go through a re-learn procedure, causing drive-ability problems. The low voltage requirements of all the computer controlled components (as well as the computer) will not drain the battery of its surface charge (the charge that you utilize to start the engine) for years.
Disconnecting a battery in some electrical systems could potentially damage sensitive computers and controls. We NEVER disconnect a vehicles battery unless we have a battery saver connected to retain the KAM and presets. If your electrical system is in proper repair, there is NO reason to disconnect the battery. If you still are concerned, install a battery booster available at your local auto parts supplier.