"Maybe the first time ever below 2/3 usage"
A local parts store (NAPA, Auto Zone, etc.) can do a "load test" on your batteries, assuming they are fully charged. A weak battery drops off charge quickly and depleats faster under use. I would just have batteries tested before re-inventing the wheel. Your batteries are 3 years old and have worked the up and down cycle pretty regularly.
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Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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