I had the battery go bad on my mower the other day. Not a big deal, just replaced it for $20 and was on my way. I was talking to another guy that said he replaces his battery every spring if it needs it or not. (I am guessing not). He said that it was like buying a $20 insurance policy without the down time. Seems to me like a waste of money. Maybe I am wrong. Does anyone else shange their battery every spring regardless of its condition?