Stop in for a cup of coffee

greymouser7 said

Battery longevity depends on the charging system (alternator, wiring, and connectors) On the coast where I live, the connections have to be cleaned and coated with dielectric grease to secure it. In Nebraska 9 years was no problem. I am under the impression that newer mowers don't function/last as well.

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In some cases. Some batteries are simply junk.
Wally world energizers is one.
My husqvarna battery lasted 7 years i think.
It sits from late october to may so i think its pretty good.
I use Parts Master batteries,the manufacturer doesent come to mind at the moment. But i get great service out of them.