[Rumpamuro]

Depending on how long the battery is out for makes the decision, sometimes yes sometimes no. Best thing to do is take one of your old cell phone car charger or some plug that plugs into the ciggarette lighter and cut the cord, by a 9v rectangular battery and attach the positive and negative and done. when u take out your battery, you wont even have to reset the time, they should sell the "pre made" adapter at your local parts store.