I never used a battery tender until it was recommended to me here. I'm knocking on wood when I say this, but I've never had a battery problem either. I rode........just about every day, so I figured it was holding a good charge. Then it was pointed out to me that longevity might be increased by using a battery tender. So I boiught one. I'm glad I did, 'cause it is real comforting seeing that little green light everyday, but that light isn't there when I'm 1000 miles from Meridianville. So, Howie's philosophy looks pretty good. What's $90 every two years versus at least a $100 tow bill on top of the $90 and lost time when it won't start after visiting some obscure location in the middle of east bumfug Idaho. 2 years..............max............battery tender or no.