They are good till they quit. lol
There is no set lifespan on them. Some batteries last a year and some, like the one in my car can last up to 8 years. The battery in my car now is 4 years old.
Both of my 2012 bikes have the stock battery in them as well.
"You're not drunk until you have to grab the grass to keep from falling off the Earth."
"It's not a party until someone throws up on a stripper."
"I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day."
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