This is my first post here on LawnMowerForum and would like too share a little knowledge. The charging system on any machine is designed to do one thing, and that is too maintain a fully charged battery.http://batteryuniversity.com/learn/ This link will take you to a site where you can learn about the proper way to maintain your batteries. I was shocked at how wrong (myself and just about everyone I know) maintained batteries! Knowledge is everything, and will save you time and money. Thank You.