I've had Yuasa batteries that last 10-yrs...
Panasonic batteries on Miatas will last 10-yrs..
Used to get 100-month batteries from Costco...
Lithium battery on my CBR600RR is going on 8-yrs now... no end in sight... Still as good as 1st day I installed it...
There's also modern desulfators circuits that'll break up surface layer on plates to ward off battery aging...
Most likely parasitic drain in this case. But yeah, constant drain will age battery in short order. Simple test for drain outlined above. Will buy him time until he gets chance to troubleshoot circuits.
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