Originally Posted by maxpower220
Batteries cost about $125, they last 4-5 yrs on avg in a boat. That's nothing. I have a battery tender and it works great. A $40 investment on a $125 battery almost doesn''t make sense, but a $100 investment on a $125 definitely doesn't make sense.
I've had a Battery Tender on my 1993 CBR900RR since it was new. Now, almost 22 years later, I am still on the second battery ever for the bike. The first went 10 years, the second has been almost 12 so far. There is no reason a boat battery should last only 4-5 years with proper maintenance. I am currently running 5 Battery Tenders on various things.