Use a battery tender, not a charger, and don't worry about it. Just attach the battery first, plug in the tender and walk away. I've used one for up to two years continuously on a sealed Optima battery in another state and never had a problem. Believe it or not, the battery has been in the pickup since winter 1998.
http://www.batterytender.com/Chargers/
Shop around and try www.smile.amazon.com.
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 Desert185 🇺🇸 (Retired Chemtrail vendor)
-Ram 2500 QC, LB, 4x4, Cummins HO/exhaust brake, 6-speed stick.
-Andersen Ultimate 24K 5er Hitch.
-2014 Cougar 326SRX, Maxxis tires w/TPMS, wet bolts, two 6v batts.
-Four Wheel 8' Popup Camper.
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