AGM battery maintainer.

11.5 years is pretty good for any type of battery. My best was a little over 6 years. Best I ever got out of a Harley brand new battery was a hair over 2 years. I'm sold on using battery tenders

I've also had 12 years out of the the last two car batteries but keeping them charged is only part of the equation. I'm in a cool climate and no one would expect to get that sort of battery life in a hotter climate. Needless to say I must be doing something right so I've bought pretty much the exact same AGM battery as a replacement. The bike is old with zero current draw so that's how I get away with not having it permanently hooked up to a maintainer.
 
Factory AGM in my '01 Road King went 10 yrs. I pulled it due to age not lack of cranking at the time having less battery knowledge.
Put an Odyssey in then in '11, it's still in there today at 14 yrs old. Both batteries were on Battery Minders whenever it was in the garage.
Makes me wonder how long that factory East Penn battery would have lasted.
 
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