A note for RV dealers, converters and OEM buyers who keep having the same conversation at the counter.
Every season it happens the same way. A customer stands in front of the shelf, looks at two batteries that are roughly the same size, and asks why one of them costs three or four times as much as the other.
It is a fair question. It is also the wrong question, and the answer most people give it, cheaper now, replace it later, is exactly where the margin leaks out of an RV battery line.
This piece is for the people who have to answer that question for a living: dealers and distributors, caravan and camper manufacturers, 4WD and overland converters, and the solar and electrical installers who end up owning the system once it leaves the showroom.
The number everyone looks at first is the wrong number
Price per battery. Or price per amp-hour. Both are the wrong unit.
The unit that matters is cost per usable kilowatt-hour, divided by how many times you can take it back out before the battery is finished.
Start with what you can actually use. A deep-cycle lead-acid battery is normally specified at 50% depth of discharge, and going past that regularly takes years off it. A 100Ah AGM gives you roughly 50Ah. A LiFePO4 pack with the same rating gives you something close to 95Ah. So when a customer lines a 100Ah lithium pack up against a 100Ah AGM and compares the stickers, he is comparing one battery against about two.
Then cycles. Deep-cycle lead-acid generally lands somewhere between 300 and 500 full cycles before capacity falls away. LiFePO4 packs in the RV class are commonly rated between 4,000 and 8,000 cycles to 80% of original capacity. Even at the conservative end of that range, it is a different order of magnitude.
Put the two together and the cheap battery is not cheaper. It is an instalment plan.
Where lead-acid still wins, and you should say so out loud
We build and sell lithium packs, so this section is not in our short-term interest. It is in our long-term interest. A buyer who catches a supplier overclaiming stops believing the rest of the spec sheet, and he is right to.
Lead-acid still makes sense in a few places.
Engine cranking. High burst current, low cost, and nobody deep-cycles a starter battery. Lithium makes no economic case here at all.
Unheated sub-zero storage. Standard LiFePO4 cells should not be charged below 0°C. Lead-acid is more forgiving. If the vehicle sits through an Alberta or northern-Scandinavia winter with no heating and no shore power, that is a genuine design constraint. It should be designed around rather than argued away.
Short ownership. A rental unit or a budget build that changes hands inside two years will not live long enough to collect the cycle-life dividend.
Tightest possible budget. If the customer’s actual decision is “what is the cheapest thing that works this season”, forcing lithium on him just loses the sale.
The honest summary is narrower than the one you see in most marketing: LiFePO4 does not win every dimension. It wins the particular combination of dimensions that modern RV builds care about. Those are two different claims, and only one of them survives contact with a technical buyer.
What actually changed is not the chemistry, it is the load list
Ten years ago the house battery ran the lights, the water pump and the control board on a gas fridge. A 100Ah bank was comfortable.
The list now reads: compressor fridge, induction hob, microwave, rooftop air conditioner, diesel or electric heating, Starlink, two laptops, a camera drone, and an e-bike charger. Banks have moved to 300Ah, 400Ah, 600Ah.
At 12V, a 3kW load is 250 amps. That means heavy cable, big lugs, real heat along the run, and voltage sag at compressor start-up that trips inverters at exactly the wrong moment. The system gets harder to install and harder to warranty at the same time.
That is the real reason 48V is spreading through RV and caravan platforms.
Why 48V is spreading, and what it costs you
For the same power, 48V moves a quarter of the current of a 12V system. Resistive loss goes with the square of current, so on the same cable you are looking at roughly a sixteenth of the loss. In practice you spec thinner copper, save a useful amount of weight, and still come out well ahead. Fusing gets simpler. Voltage sag stops being the thing that ruins the customer’s weekend.
It is also why the gasless caravan has become a serious product category in Australia, and why European motorhome platforms keep turning up with 48V native architecture. That is not a marketing trend. It is the load list forcing the voltage up.
The cost is real too. A 48V bank needs a 48V inverter-charger and a system designed around it from the start. It is not a drop-in for a 12V loom, and any supplier who tells you otherwise has not installed one.
ODIPIE is the brand of Shenzhen Lead New Energy Co., Ltd., a manufacturer of LiFePO4 packs for RV, marine, golf cart and residential storage applications, and of sodium-ion battery packs.
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Post time: Oct-26-2026
