That beeping sound is very likely the CO detector. My previous rig did that when the house battery was getting low. Served as a good reminder for me to either crank up the genny or plug 'er in for a while to top off the battery.
Sounds like you're in the market for new batteries.
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Ed
Some Other Brand w/2020 Jeep Gladiator Toad
Living The Dream in "God's Waiting Room"
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