I am trying a timer with my charger in an attempt to prolong battery life. A friend from work is an electric scooter enthusiast so he puts a lot of effort into keeping batteries in top shape. He says that you should never charge a battery when it's hot. After you discharge it, you need to let it cool down before you begin the charge cycle. So I got a lamp timer (link below is for a similar timer) and plugged my charger into it. I set the lamp timer so that it turns on at midnight and then stays on continuously. After I'm done mowing, I turn the timer to off and plug the mower in. At midnight, the timer turns on and the mower should be ready to go by 8:00AM.
I got new batteries in spring, 2013, so I don't know if this is going to help. But I figure it can't hurt.
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