Product Development Help US Review

I will be out of town for about three months. I was wondering what to do with my car. Someone told me that the car battery will completely drain and I need to get a replacement when I come back. Any comments?
BTW my car is 2000 toyota camry v6.

The retailer in question sells both new and used products. It differentiates between the two by virtue of the product being opened. If the product is not opened, it is new. If it is opened, it is used. The retailer charges different amounts for a used product than it does a [...]