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Location: Bluegrass of KY
They are only going to last 2-3 years so I would not worry about it a bunch.
Don't buy the heavy duty and you are only out about $7 a year.
1st class birdhouse builder/scrapwood mfg.
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Location: SoMar
I bought a Diehard Gold about 5 years ago & it's still going strong. Knock on wood. It sits in a unheated garage the whole winter, but at least it's not out in the weather.
The new battery should have a date sticker on it to indicate when it was made.
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Location: Fort Worth
The manufacture date is heat stamped into the case. Often it's on the bottom and sometimes it's a code depending on the battery brand. Most all batteries are made by exide the rest are made by Johnson controls and a few are made by delphi. So it really doesn't matter what you buy.
Buy the cheapest one as getting 2 to 3 seasons out of a battery is about parking for the course. I have a small solar charger hooked to mine and it works well. Never had to charge it at all in the winter.
Also if you live in a hot climate battery life is much shorter than in cold climates.
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All the garden tractor sized ones I've bought all come with the acid in a separate container. I think as long as the acid hasn't been added they last quite a while with no ill effects.
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FWIW, I used to repair power wheelchairs and scooters. They all use 2 12 volt gel batteries. Typically, one battery will fail after a year or 2. They always get replaced in pairs, so one is usually good. (there are good reasons to replace both) I put one of the "good" ones in my old mower, and it lasted for 13 years. It did die, after sitting in storage for 2 years, though. I did nothing to the charging system, or anything.
It might be worth checking into. New gel batteries run a hundred bucks or more, so if you can find a used one, that is going to be scrapped, you might pick it up real cheap. If the open circuit voltage is 12 volts or above, chances are the battery is good.
Good luck