The Best RV Batteries (Deep Cycle) Optima 8016-103 D34M BlueTop Starting & Deep Cycle Marine Battery. Odyssey PC680 Battery. Universal UB121000-45978 12-volt 100AH Deep Cycle AGM Battery. VMAX857 12-volt 35AH AGM Battery Marine Deep Cycle Battery. Renogy 12-volt 100Ah Deep Cycle AGM Battery. Click to see full answer. Also asked, what kind of battery does an RV use?Batteries used in RVs are lead acid batteries, which means they have several cells connected in series. Each cell produces approximately 2.1 volts, so a 12-volt battery with six cells in series produces an out put voltage of 12.6 volts.Also, what charges the house batteries in an RV? The typical alternator on a motorhome or tow rig engine can charge batteries at from 40 amps to 100 amps. When there is no shore or generator power available, they invert battery power to household power. When shore or generator power is available, they switch to being a smart multi-stage charger. Similarly, how long should house batteries last in an RV? Check the state of charge on a regular basis, and after the batteries have charged check the water levels. The bottom line is a little routine maintenance and recharging a discharged battery as soon as possible will extend the life of the battery. RV batteries can and should last 5 to7 years, rather than 1 to 2 years.Is it OK to leave RV plugged in all the time?Yes, you can keep your Travel Trailer plugged in all of the time. One of the things you need to monitor is the house batteries for the trailer. You should check the electrolyte levels on your batteries at least once a month to make sure that they are not low or have gone dry.