The battery is the most expensive component in a caravan power system, and the one expected to last the longest — which means picking the wrong one is a far costlier mistake than any other part of the setup. Instead of asking the abstract “which is better” question, this guide compares the three main technologies — gel, AGM, and LiFePO₄ — by asking which one actually fits your usage pattern, both financially and practically.
The Question That Actually Matters: Total Cost of Ownership
At first glance, the price gap between a 100Ah lead-based battery (gel/AGM) and a 100Ah LiFePO₄ battery makes lithium look like a luxury. But the picture changes once you look at real usable capacity: manufacturers typically recommend not exceeding 50% depth of discharge (DoD) on gel/AGM batteries — so the safely usable portion of a “100Ah” battery is really about 50Ah. LiFePO₄ batteries, by contrast, can be safely discharged to 80–90% DoD, so the same 100Ah-rated battery delivers roughly 80–90Ah of usable energy in practice. Add cycle life on top of that (500–700 cycles for gel/AGM versus 2000–4000+ for LiFePO₄), and the math shifts: LiFePO₄’s cost per usable Ah and per cycle usually ends up lower over the long run, even though its upfront price is 2–3 times higher. That math matters less for occasional weekend use, but it makes a real difference for anyone camping 50+ nights a year.
The Practical Differences Between the Three Technologies
Gel batteries are sealed thanks to their gelled electrolyte and hold up slightly better than AGM under deep discharge, but they can struggle with high instantaneous current draws (an appliance like a coffee maker, for example) and they’re heavy. AGM batteries use a glass-fiber separator, can deliver higher current than gel, and accept charge faster, but their deep-discharge tolerance is slightly lower than gel’s. LiFePO₄ batteries are in a different category altogether because they use a different chemistry: they weigh roughly half of an equivalent-capacity lead-based battery, include a built-in BMS (Battery Management System) that protects against overcharge/overdischarge, and offer 2000+ cycle life. The detail that matters most: most LiFePO₄ batteries should not be charged below 0°C (the BMS usually blocks this automatically) — if you plan to camp in cold climates in winter, you either need a heated model or you need to check battery temperature before charging.
Brands: Who Fits Which User?
Victron Energy — For Anyone Who Wants Bluetooth Monitoring
Victron’s Deep Cycle Gel 110Ah is a classic, reliable gel battery (about 700 cycles @ 50% DoD, 33 kg). What really stands out is its Lithium Smart 100Ah LiFePO₄ line: the VictronConnect app lets you monitor voltage, current, and state of charge (SoC) over Bluetooth from your phone — a genuine convenience when the battery sits somewhere hard to reach in the caravan. For anyone already running a Victron MPPT or inverter, ecosystem compatibility is an added bonus.
Renogy — For the Longest Cycle Life Available
Renogy’s LiFePO₄ 100Ah model offers 4000+ cycles — the highest figure in this comparison, meaning roughly double the usable lifespan of the other brands in daily use. Its AGM 100Ah model is a maintenance-free, relatively affordable option. If your budget is tight and you want to test the waters before committing to lithium, Renogy’s AGM is a reasonable intermediate step.
Epever — For Anyone Already Running an Epever Charge Controller
Epever’s 100Ah and 200Ah LiFePO₄ models stand out particularly with the 200Ah option, aimed at sustained off-grid use — practical if you want large single-battery capacity. However, its official distributor network in Turkey is more limited than the other brands here, which can slow down the warranty/service process somewhat.
Mexxsun — For Domestic Service and System Consistency
Mexxsun’s gel and LiFePO₄ models are documented together in their guides alongside their own inverters, making them a practical choice if you want to source your entire system from one brand. Its LiFePO₄ 100Ah model offers 3000+ cycles, above Victron’s figure and just below Renogy’s. Being Turkish-made makes reaching service easier in case of a fault.
Technical Comparison Table
| Brand / Model | Technology | Capacity | Cycle Life | Weight | Standout Feature |
|---|---|---|---|---|---|
| Victron Deep Cycle Gel 110Ah | Gel | 110Ah | ~700 @50% DoD | 33 kg | Sealed, good deep-discharge tolerance |
| Victron Lithium Smart 100Ah | LiFePO₄ | 100Ah | 2000+ @80% DoD | 14 kg | Bluetooth monitoring (VictronConnect) |
| Renogy AGM 100Ah | AGM | 100Ah | ~500 @50% DoD | 30 kg | High current draw, maintenance-free |
| Renogy LiFePO₄ 100Ah | LiFePO₄ | 100Ah | 4000+ | 11.5 kg | Highest cycle life here |
| Epever LiFePO₄ 100Ah | LiFePO₄ | 100Ah | 2000+ | 12 kg | Built-in BMS |
| Epever LiFePO₄ 200Ah | LiFePO₄ | 200Ah | 2000+ | ~22 kg | Large capacity for sustained off-grid use |
| Mexxsun Gel 100Ah | Gel | 100Ah | ~600–700 | 31 kg | Easy domestic access |
| Mexxsun LiFePO₄ 100Ah | LiFePO₄ | 100Ah | 3000+ | 12 kg | Lightweight, domestic service |
A Decision Based on Real Usage Scenarios
If you camp a few weekends a year and usually have access to shore power or a generator for frequent recharging, the cost/performance balance of AGM or gel can make more sense than lithium — you may not have enough usage time to recoup the investment. On the other hand, if you spend most of the year off-grid or regularly take multi-week trips, LiFePO₄’s higher upfront cost typically pays for itself within a couple of seasons through cycle life and usable capacity. If you plan to camp in cold climates during winter, be sure to check the manufacturer’s BMS specs for the below-0°C charging restriction — some models include built-in heating, others don’t. If you frequently run appliances with high instantaneous current draw (coffee maker, hair dryer), AGM has a slight edge over gel there.
Charge Controller Compatibility: An Overlooked Detail
The most commonly missed step when switching to LiFePO₄ is checking whether your existing charge controller (solar MPPT or charger) supports the LiFePO₄ charging profile. A controller configured for lead-acid derivatives will either undercharge a LiFePO₄ battery or use the wrong voltage profile, causing the BMS to cut off early. Before buying a new LiFePO₄ battery, verify that your controller’s product page or manual lists a “LiFePO₄ profile” or “Li-ion” option — otherwise the battery will perform well below its theoretical lifespan.
Frequently Asked Questions
Is gel or AGM better?
Gel batteries hold up slightly better under deep discharge, while AGM batteries have an edge with high instantaneous current draws. Both are lead-based, making them heavier and shorter-lived than LiFePO₄.
What is the real downside of LiFePO₄ batteries?
The purchase price is high, and most models cannot be charged below 0°C (the BMS blocks it). However, the usable capacity, cycle life, and weight advantages typically offset this cost over the long run.
How much battery capacity should I choose?
Calculate your total daily energy consumption (Wh), add a 25% safety margin based on your solar/charging setup, and determine the required Ah based on your chosen technology’s safe depth of discharge (50% for gel/AGM, 80–90% for LiFePO₄).
Can I use my existing charge controller with LiFePO₄?
Only if you confirm it supports a LiFePO₄/Li-ion charging profile. A controller configured for lead-acid may not charge LiFePO₄ correctly.
Disclaimer: This content uses manufacturer and retailer technical data; prices and stock availability may change over time. Before purchasing, review current technical documentation and have installation done by a qualified technician.
