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Industry recommendation is 5 years for non Li batteries.
I had a pre-Pandemic battery (2018?) on my 911 which still worked fine, but it was on a tender most of the time. Finally swapped it out.
On the other hand, I was stranded in a parking lot at one point due to a bad/old battery in my minivan. Luckily, there was a parts store across the street. Except I had to carry the battery back across.
If I don't forget, I'd swap them out after 5 years. Not too bad at $179, which works out to $36 a year.
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