Last updated: May 21, 2026
Introduction
Your battery bank is the energy storage foundation of your van life electrical system — everything else depends on it. Choosing between lithium LiFePO4 and AGM lead-acid, sizing the bank correctly, and selecting the right battery management components are decisions that affect your van life comfort every single day. This guide breaks down the best battery options and management systems for van conversions.
What to Look For
See also: Best Portable Solar Panel for Van Life (2026 Guide) • How to Document Your Van Build: Best Tools for Recording Your Conversion
- Lithium vs. AGM: Lithium LiFePO4 batteries have 4-5x the usable capacity of AGM at the same amp-hour rating (AGM should only be discharged to 50%; lithium to 80-90%), last 10x longer, charge faster, and weigh about half as much. The higher upfront cost is offset by superior long-term value for full-time van lifers.
- Usable Capacity & Daily Consumption: Calculate your daily power consumption in watt-hours, then size your battery bank to hold 2-3 days of consumption. This buffer handles cloudy days and prevents over-discharging. For a van with a refrigerator and electronics, 200Ah lithium is a reasonable starting point.
- Battery Management System (BMS): Every lithium battery bank needs a BMS to prevent overcharge, over-discharge, and temperature damage. Many drop-in lithium batteries include a built-in BMS. Standalone BMS units like those from Victron offer more monitoring and control options for DIY builders.
Top Picks
Battle Born 100Ah LiFePO4 Deep Cycle Battery
Battle Born is the most widely trusted lithium battery brand in the van life community — their 100Ah LiFePO4 batteries have powered thousands of builds across every climate. Each battery includes a built-in BMS with temperature protection, delivers 100Ah of usable capacity (vs. 50Ah for an equivalent AGM), and is warranted for 10 years. Two Battle Born batteries wired in parallel give 200Ah — an excellent starting point for a full-time van setup with refrigerator and electronics.
Victron SmartSolar MPPT 100/30 Charge Controller
Victron Energy is the European power electronics brand that serious van life builders trust for charge controllers, inverter-chargers, and battery monitors. The SmartSolar MPPT 100/30 handles up to 400W of solar input and charges at up to 30A with maximum power point tracking efficiency. Bluetooth monitoring via the VictronConnect app lets you see real-time solar input, battery state, and charge history from your phone — invaluable for understanding and optimizing your electrical system.
Renogy 200Ah AGM Deep Cycle Battery
For van lifers building on a budget who aren't ready for lithium, Renogy's 200Ah AGM battery is a solid, proven option. AGM batteries handle vibration well (critical in a moving vehicle), require no maintenance, and can be mounted in any orientation. At 200Ah rated capacity with a 50% recommended depth of discharge, this battery provides 100Ah of reliable daily use — enough for lights, device charging, and a fan, though not adequate for a compressor refrigerator without significant solar input.
Final Thoughts
If you're building a van for full-time or extended use, lithium batteries are worth the investment — the improvement in usable capacity, charging speed, and longevity is dramatic. Battle Born and Victron components work together exceptionally well and represent the premium end of a van life electrical system. For weekend and occasional use, quality AGM batteries sized generously will serve you reliably at lower upfront cost.
