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I just use a extra boat battery and drag it in the house (My girlfriend is pretty lenient) lol. I recently bought a 12v lithium battery to run on the boat solely for my Garmin. Attached is a screenshot of what’s available at Walmart. I paid more for the one I bought but I plan on using it all day some days. I’m sure the 2ah battery would be good for a few hours at a time just for the house.
