Well. After all this time of my supporting the benefits of a battery tender on all vehicles when they are not in regular use, I guess it's time to eat a little crow (so to speak). Went out today to flash up my Can-Am ATV, only to hear the click click click of the starter.... .... So a boost later and getting the ATV into my shop, I proceeded to investigate the problem. After a full charge to 13 volts with a standard battery charger, I pulled out my trusty battery load tester and lo and behold, my battery is kaput, toast, worn out. Obviously using a tender on this battery for the last 15+ years has totally failed me. I would have expected one of those little 18 Ah, 270 CCA batteries to have lasted much longer than that...I guess a warranty claim is out of the question.... ..... Ok... So a little tongue in cheek here. Bought the ATV new in 2007 and this is the first battery change.... Wow....