Motorhome Batteries
Motorhome batteries come in two sets, and only one of them is the house bank. The chassis battery starts the engine; the house batteries run everything you live on, from the residential fridge to the furnace to the inverter. We carry lithium ion batteries for motorhomes in the house-bank sizes Class A, B and C coaches use, from a single 12V 100Ah to 460Ah-class banks that replace a whole bay of six-volt lead-acid pairs.
Lithium Ion Battery For Motorhome
Deep CycleGroup 24Dakota Lithium 12V 100Ah Deep Cycle Heated RV Battery
Dual PurposeGroup 24Dakota Lithium DL+ 12V 135Ah Dual Purpose RV Battery (1000CCA)
Deep CycleGroup 25Ionic Lithium 12V 60Ah Deep Cycle RV Battery with Bluetooth
Deep CycleGroup 31Ionic Lithium 12V 100Ah Deep Cycle RV Battery with Bluetooth
Dual PurposeGroup 31Ionic Lithium 12V 150Ah Dual Purpose RV Battery (1600CA)
Deep CycleGroup 8DEPOCH 460Ah 12-Volt Deep Cycle RV Battery V2 Elite (5.89kWh)
House Batteries and Chassis Batteries Are Different Jobs
The chassis battery under the hood is a starting battery: one short burst to crank the engine, then it rests, and it stays lead-acid or AGM like any truck. The motorhome house batteries in the bay are deep cycle: steady current for hours, drained and recharged night after night. Everything on this page is a house battery. When the coach is parked with the engine off, this is the bank that decides how long you can stay.
Replacing 6 Volt Motorhome Batteries With Lithium
Most coaches leave the factory with pairs of six-volt golf-cart style lead batteries wired in series to make 12V. A pair rated around 220Ah delivers about 110Ah before lead-acid starts to wear, and it weighs 120 to 130 pounds. One 12V 200Ah lithium replaces that pair with more usable capacity than both, at about a third of the weight, and a four-battery bay becomes two 200Ah packs or a single 460Ah-class battery. A motorhome battery replacement in lithium keeps the same 12V system; what changes is the charging, covered below. One rule: do not mix lithium and lead in the same bank.
Sizing a Motorhome House Bank
Coaches carry bigger loads than trailers. A residential fridge alone runs about 125Ah a day through the inverter, the furnace fan adds 15 to 25Ah on a cold night, and the microwave, lights and water pump stack on top. That is why deep cycle motorhome batteries in lithium usually land at 200 to 400Ah for a coach that plugs in most nights and at the 460Ah class for one that does not. Lithium also takes charge at the generator’s full rate from empty to full, so generator run time drops to a fraction of what a lead bank needs.
Charging: Inverter-Charger, Alternator and Solar
The inverter-charger needs a lithium profile; most current units have one in the menu, and older units are the one thing worth checking before the batteries arrive. Alternator charging while you drive goes through a DC-DC charger, which protects the alternator and gives the bank the right voltage. Solar works through any controller with a lithium setting. Our charger lineup covers the shore-power side, and our lithium versus lead-acid guide walks through the whole conversion.
We stock motorhome lithium from EPOCH, whose 460Ah V2 Elite is the one-battery house bank, alongside Dakota Lithium and the rest of our RV battery lineup. Every pack carries its full manufacturer warranty and ships from one of our U.S. warehouses closest to you.
Motorhome Batteries FAQ
What is the difference between motorhome house batteries and the chassis battery?+-
The chassis battery starts the engine and stays lead-acid or AGM, like any truck. The house batteries are deep cycle and run the living space with the engine off. Lithium replaces the house bank; the chassis battery is a separate system and stays as it is.
Can I replace my 6 volt motorhome batteries with lithium?+-
Yes. One 12V lithium replaces a series pair of 6V lead-acid batteries with more usable capacity at about a third of the weight. Replace the whole bank at once, never mix lithium and lead in one bank, and set the inverter-charger to a lithium profile.
How many batteries does a motorhome need?+-
Count amp-hours, not batteries. A coach that plugs in most nights is comfortable at 200 to 400Ah of lithium; a coach that boondocks with a residential fridge wants 400Ah or the 460Ah single-battery class. One 200Ah lithium does the work of a 6V pair, so the count usually halves.
Will lithium work with my motorhome inverter-charger?+-
If it has a lithium profile, yes, and most current inverter-chargers do. Older lead-acid-only units undercharge LiFePO4 and should be updated or replaced before the bank goes in. Alternator charging goes through a DC-DC charger. Call 888-274-7544 with the model number and we will tell you which case you are in.