How long can a battery possibly last

I have a yellow top auto zone dura last gold that I bought two days before Thanksgiving in 2009.

It was a very cold day, I went out to start a yellow 74 duster and "click click click". I tried charging the old battery but it was out for the count. So my dad gave me a ride to auto zone. I told the guy, I need a battery for my duster and to power a winch. I need a good battery, one that just won't quit.

So he sold me this one. . .. and it just won't quit. It has been in multiple mopars over the years and the yellow duster is long gone. One time it even served as a loaner in my friend's truck when his went dead.

Today I used it to power a winch and it did a great job so I put it on the charger and thought "how long is this thing going to stay with me"

I keep it on the float charger in the "battery room" when not in use, so here it sits for the weekend till Monday morning when it will take me to work again so faithfully.

How long do these things last usually??

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There was a thread on here a few months ago that explained how to rinse out the case and change the electrolite and bring the dead ones back to life again...