Actually it is bad to keep the batteries idle for more than a month at one go. This is something that has been debated many times over with no positive results and there is nothing you can do about it.

http://www.crzforum.com/forum/engine-battery-discussion/4798-winter-storage-question.html

Try this link.

Answered by KHLow2008 (expert)
40,318 answers provided