Quote:
Originally Posted by Whitespeed
If you're going to be storing the car for say, a couple of months or more, you could remove the battery and bring it home to keep charged. Disconnect it at the very least, if it's going to sit for more than a couple of weeks. It will self discharge, but that will be much slower than the draw from the car while it's sitting unused. Mind you, these cars do have a transport mode, which reduces draw to a minimum while connected. That may be good enough.
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I agree with this versus disconnecting the neg cable. If you can get the battery out easily, (it’s not that hard), best thing is to have it sitting on your shelf inside for the winter with a $30 battery tender attached. Hook it up and forget it.
But AGM’s can take the cold, but the secret is having them at 100 percent charge when you disconnect them. AGMs discharge a lot less than a standard Lead acid battery.