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Message: <blockquote data-quote="SoonerP226" data-source="post: 4392160" data-attributes="member: 26737">…or you let it sit for two weeks. Modern cars have electronics that never completely shut down, and if you let the car sit long enough, they’ll drain the battery below the voltage the car needs to start. Two weeks is more than enough time for the car to drain the 12V battery to below 12V. When I had the Rona, I didn’t leave the apartment for the better part of three weeks. The first time I did, my brother came to take me out for a ride in my truck, but those three weeks had seen it sitting too long, so it had to suffer the indignity of getting a jump start from a Prius. After I got back into the swing of things and started driving regularly, it didn’t need another jump start until the battery finally reached the end of the trail.</blockquote>