We have the residential fridge in ours and had the same issue with the battery alarm. We now have 4 lead acids, only because you cant buy the lithiums in a store anywhere.
I would DEFINITELY go with a 200 amp hour single lithium over the 4 batteries we have now i we were able to have waited to get them.
Everything ive read says you will get twice the useable hours out of them, and theres no power drop off.
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