I've always gotten at least 4 years out of Interstate atv batteries, but the atv's stay in the garage which never gets below 40' and I run my atv's year round.
I was going thru batteries and last year, took it to the deal and he tested the atv. There was a corroded wire that was preventing the battery from being charged.
Might be worth looking into having the charging system tested.
What kind of quad? I always had really good luck with Yuosa (spelling) batteries. Replaced my stock Yuosa with one with higher cranking amps(Yuosa also)in 2005 and still have in my quad.
The stock battery in my mule 610 was junk. I replaced it with a gel battery for the Harley Davidson V-Rod. I've had it in almost four years now with no problems. The mule is stored outside, under a picnic pavilion. In the winter, I have it plugged in to a cheap battery tender.
X2 on the battery tender. If there is no electical outlet nearby then get a solar tender. Batteries last 5 or 6 years plus. My lawn tractor is on it's 5th summer.
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