I reckon 8 years and they're about done. The first provocation after that, and they're done.
Just ordered one for the Roomie, which has been flat twice in the last 2 weeks, the first time after having been unused for two weeks. It was fully charged this Friday, used for 3 miles on Saturday morning, dedded today 48 hours later.
8 years and one month old. Right on cue.
I might order one for the MX-5 - too soon perhaps at 5 years, but it has been allowed to run low a few times and it's going to Austria in September if we are spared. It would be mighty inconvenient were it to conk out in France on a Sunday soir.
I'm pretty sure we've had this discussion fairly recently (Smokie?) and the wisdom was that £50 is cheap insurance when you know you'll need one before too long.
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