My Blue top Optima died today :(tomorrow it will be 5 years.
Blue top cost 6/9/2017 $202.95
Blue top cost 6/8/2022 $230.00
Take away -running miss-matched batteries in parallel 100% of the time is not a problem
YMMV🖕
My 4+ year test results
I run dual batteries 1 in the factory location and 1 in the rear back corner
Batteries are wired in parallel and never separate
Batteries manufacturers do not match 1 Optima Blue and 1 Duracell marine
Battery sizes do not match 1 Blue Optima group 34 55AH and 1...