Blowby
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Have had mine (yellow tops) from Costco iirc 2005 and they have served me well although I think they are fading. They do get put through a workout due to E compressor, inverter etc etc. I think if you look at diehards from sears in the USA they are dry cells. The thing I like about the dry cells is no cleaning of posts compared to the standard lead acid ones.
jrc
Charge them with CTek to recondition it will bring back the Optima to as good as new. I guess the old Optima's are the good ones like my Red Tops.