This is a great thread. Surprised it fizzled out.

Just curious what kind of lifetime everyone got out of the Costco batteries? I purchased one Costco DC 27 in March 2017 and it finally died after many many hours and miles of trolling in May 2020. Costco has raised the price to $88 at my Costco. I purchased two batteries this week and plan to wire them in parallel hoping for longer run time and less discharge per cycle. Costco battery guy said they typically get 3-3.5 years out of these batteries. My Interstate store guy said the same thing about their battery being higher quality. I am skeptical.