Swapping a lead-acid battery for a lithium one marks a turning point for your campervan. LiFePO4 chemistry offers more usable energy, lower weight, faster charging, better voltage stability and a much longer service life than lead-acid. You’ll notice the difference every day: greater real-world range, fewer worries and the peace of mind that comes with a reliable system, even under high power demands.
With lead-acid, AGM or GEL batteries, it is recommended to use only 50% of the total capacity so as not to shorten their service life. With lithium batteries, this usable percentage rises to 80–90%. For example: a 12V, 200Ah AGM battery delivers around 1200Wh of usable energy; a lithium battery with half that capacity, 100Ah, already provides around 1000–1100Wh of usable energy. And it’s not just that they have more usable capacity: lithium batteries maintain a much more stable voltage, so sensitive devices such as fridges, inverters or routers operate more efficiently.
The key to comfort in a campervan is the usable power available on a day-to-day basis. Lithium minimises voltage drop during power consumption: the fridge no longer “struggles”, the inverter delivers its full rated power, and the regulator operates within its optimal range. The result is fewer deep discharge cycles and, therefore, a longer service life. Furthermore, lithium batteries charge faster: they can handle higher charging currents (provided the charger and BMS allow it), which is perfectly suited to modern alternators and DC-DC chargers such as the Victron Orion.
💡 In summary: more usable energy, greater real-world range and equipment that performs better, even at peak consumption.
Lithium weighs between 50 and 70% less than lead for equivalent capacities. In a campervan, where every kilo counts, less weight means more payload for water, bikes or luggage. Furthermore, as they can be installed vertically, horizontally or on their side, LiFePO4 batteries are better suited to the confined spaces of a campervan.
A good LiFePO4 battery offers between 2,000 and 4,000 charge/discharge cycles at 80% DoD, compared with 300–600 for an AGM battery. Maintenance is virtually non-existent: no leaks and no need to check the electrolyte. You just need to ensure that the charger is compatible and to set the charging voltages correctly when installing the battery. Otherwise, all that’s required is some ventilation and an occasional check-up.
If you cover long distances between stops, you’ll already know that the combination of alternator + booster charger, such as the Victron Orion models, is the best way to ensure your batteries always perform at their best.
Thanks to lithium, you can make the most of every minute on the road: they can handle high-power charging for longer, quickly recharging the energy used overnight to power the fridge, lights and comfort features.
And when power consumption peaks, the voltage remains stable, giving you longer battery life and the real feeling of having a full battery all day long.
Ultimately, lithium is an investment that pays for itself thanks to its convenience, range and reliability.
When calculating capacity, think in terms of Wh, not just Ah. A simple way to get it right is to add up your daily consumption and add a 20–30% margin. Follow these steps to work out the battery capacity you actually need:
As a rule of thumb:
Victron lithium batteries are compatible with a wide range of chargers, although we always recommend using those from the Victron ecosystem itself.
When choosing a compatible charger, bear in mind the power source you’ll be using to charge the battery:
At first glance, lead seems cheaper than lithium. But to be fair, you need to compare them in terms of usable Wh and cycle life: switching to lithium involves a higher initial investment, although in return you get a much more durable system.
A simple example (figures are rounded and for illustrative purposes only):
In short: you pay more initially, but in the medium term lithium works out cheaper than lead because you don’t have to replace the battery every two years.
With our Victron lithium conversion kits, you won’t need anything else. They include everything you need to replace the lead-acid batteries in your system with more durable and efficient lithium batteries. Available in two capacities:
100Ah Lithium Replacement Kit Victron
Replacement Kit Lithium 150Ah Victron
Each one comes with a battery and an Orion booster charger designed for its capacity. You’ll just need the additional cables, which you’ll also find in our electrical equipment.
Switching to lithium, step by step:
⚠️ Important: Never connect batteries of different chemistries in parallel (lead-acid + lithium). Use the lithium battery as a separate auxiliary system.
Although lithium batteries require very little maintenance, these tips will help you extend their lifespan and ensure your installation remains safe:
| Feature | Lithium Battery | AGM / Lead-acid battery |
|---|---|---|
| Discharge depth | 90% | 50% |
| Life Cycles | +3000 | 300-500 |
| Weight | Very light | Heavy |
| Load efficiency | 99% | 80% |
| Maintenance | Void | Requires care |
In the long term, switching from lead to lithium guarantees you maximum usable capacity at the best price. With the right capacity, a reliable BMS and compatible chargers, you’ll stop worrying about where you can plug in and start enjoying your journey with peace of mind. That’s the true value of lithium: travelling without limitations.
Get one of our lithium conversion kits and enjoy a longer range on your journeys.
What capacity do I need to last 1–2 days without recharging?
Between 100 and 150Ah is usually enough for a fridge, lights and mobile phones. If you’re also working from home or using a microwave, aim for 200Ah.
Can I use my current solar regulator and charger?
Only if they support a LiFePO4 profile or are configurable. If not, change them so as not to shorten the lithium battery’s lifespan.
Is a DC-DC converter from the alternator required?
In smart alternators (Euro 5/6), yes. It protects the alternator and ensures correct and rapid charging.
Is lithium dangerous?
LiFePO4 is very stable provided the BMS is of good quality and the protective circuits are correctly rated. Fit fuses and use suitable cable.
Can I keep the lead-acid battery as a backup?
It’s best not to mix battery types in parallel. You can keep the starter battery separate and use the lithium battery solely as a backup.
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