The battery this guide is built around: the Eco-Worthy 12V 280Ah metal-case LiFePO4 — metal enclosure, mounting feet, one-touch safety switch, no battery box needed. Free U.S. shipping & free 30-day returns ; 5% off your first order with code RVSAFE5 .
Swapping a lead-acid bank for one high-capacity lithium battery is one of the most satisfying DIY upgrades in RV ownership — a morning's work for most travel trailers. Here's the sequence, including the two steps people most often get wrong (converter profile and cable sizing).
1. Choose the location
A metal-case battery with mounting feet can bolt straight into a front tongue box, a pass-through bay, or under a dinette seat — no vented battery box required (LiFePO4 doesn't off-gas like lead-acid). Mind three things: the 68.5 lb weight (get a helper), cable run length to the DC panel, and temperature — an interior or enclosed bay location helps in winter because lithium must not be charged below freezing. The Eco-Worthy's BMS pauses charging in the cold to protect itself; an inside mount means that protection rarely has to trigger.
2. Size the cables and fusing
A 200A BMS can deliver 200A continuously — your wiring must match. For inverter setups: 2/0 AWG cable for runs up to about 6 feet, with a 250A Class T or MRBF fuse as close to the positive terminal as possible. For modest 12V-only rigs (no big inverter), 4 AWG with a 100–150A fuse is typical. Torque the terminal bolts properly — loose lugs, not cells, cause most "bad battery" complaints.
The same cabling logic applies to the high-capacity LiTime batteries we carry, which share the 200A BMS rating: the 12V 230Ah (200A continuous, 1,000A for one second) and the 12V 320Ah Mini (2,560W continuous, 1,000A peak). Size the main fuse and cable for that 200A continuous figure, not the surge. LiTime recommends its 14.6V 60A charger or 60A MPPT to wake the 230Ah’s Bluetooth on first use.
3. Check your converter — the step everyone skips
Your RV's converter must have a LiFePO4 charge profile (14.4–14.6V absorption). Many factory converters are lead-acid only (13.6V float) and will leave a lithium battery perpetually at 80–85% — you'll never see the capacity you paid for. Options: switch the converter's jumper to lithium mode if it has one, replace the converter section with a lithium-ready unit, or add a DC-DC/AC charger with a lithium profile. Our Victron charger lineup covers both routes.
4. Add solar if you boondock
A 280Ah battery pairs naturally with 300–500W of panels. A properly sized MPPT controller harvests 20–30% more than PWM from the same panels — worth it at this battery size. Browse our solar power collection for panels, controllers, and mounting hardware.
5. First power-up
- With the safety switch OFF, connect negative first, then positive, then accessories.
- Switch the battery output ON and pair the Bluetooth app — confirm state of charge and cell voltage look sane.
- Run a load test: pump, lights, fan. Then plug into shore power and confirm the app shows charging current and a proper 14.4V+ absorption voltage.
- Label the fuse and switch location for whoever services the rig next.
Common questions
Can I keep my existing battery monitor?
Voltage-based monitors read lithium poorly (the discharge curve is flat). Use the built-in Bluetooth app, or add a shunt-based monitor for a permanent display.
Do I need to disconnect it for storage?
The one-touch safety switch makes this easy: switch output off, and self-discharge is minimal over a winter. Store at 50–80% charge, not full.
Can my tow vehicle charge it through the 7-way plug?
Only at a trickle — the 7-way charge line is thin-gauge. For meaningful drive charging, add a DC-DC charger rated 20–50A.
New to lithium? Start with our sizing guide and the 280Ah brand comparison — or go straight to the Eco-Worthy 280Ah product page.
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