A Group 24 lithium battery is the easiest upgrade in RVing: it drops straight into the same footprint your old AGM or flooded battery occupied, but delivers roughly double the usable amp-hours and a third of the weight. If you're replacing a single lead-acid battery and don't want to re-engineer your compartment, this is the move.
Why the Group 24 size matters
Group 24 is one of the most common RV battery trays — roughly 10.25" L × 6.8" W × 8.9" H. Most travel trailers, truck campers, and van builds ship with one or two. A LiFePO4 in that exact case means:
- No tray modification: bolt it in where the old battery sat.
- Real 100Ah usable: ~90–100Ah usable vs ~50Ah from a 100Ah AGM.
- Lighter: ~24–27 lb instead of 60+ lb of lead-acid.
Switching the chemistry? Our lithium vs AGM piece shows the real-world math, and our install guide covers the swap.
Will it fit my tray?
Almost always yes — that's the point of a "Group 24" form factor. Two things to check:
- Terminal type: most LiFePO4 use M8 threaded posts; grab matching lugs or adapters.
- Height: a few "Group 24" lithiums are slightly taller for built-in Bluetooth; measure your clearance.
- Ventilation: LiFePO4 doesn't off-gas, so you can safely put it inside a living space where lead-acid never belonged.
The Group 24 batteries compared
| Battery | Capacity | Notes |
|---|---|---|
| HumsiENK 100Ah Group 24 | 100Ah | Bluetooth, true Group 24 size |
| WattCycle 100Ah Group 24 BT | 100Ah | Bluetooth, value pick |
| LiTime 12V 100Ah Group 24 | 100Ah | Popular drop-in |
| Battle Born 100Ah Group 24 | 100Ah | US brand, strong warranty |
| Renogy 100Ah Group 24 | 100Ah | Widely stocked |
Our pick
- Best all-round: HumsiENK 100Ah Group 24 — exact footprint plus Bluetooth at a fair price.
- Best value: WattCycle 100Ah Group 24 BT — same size and features for less.
- Best known brand: Battle Born 100Ah Group 24 — the name RVers recognize, with a long warranty.
Shop Group 24 lithium
HumsiENK 100Ah Group 24 (Bluetooth)
See the full list of 12V LiFePO4 batteries we recommend.
Can I run two Group 24 lithiums in parallel?
Yes — parallel keeps 12V and adds capacity (two 100Ah → ~200Ah usable). Match brand, capacity, and ideally batch; let the BMS balance them. Our lithium battery guide covers sizing.
Do I need a new charger?
You need a lithium-aware charge profile (no equalization, ~14.4–14.6V absorption). Most modern RV converters support it via a dip switch. See our charging guide.
Group 24 enough for a fridge?
One 100Ah Group 24 easily runs a 12V compressor fridge for a weekend. For multi-day boondocking with an inverter, consider stepping up to a 300Ah battery or paralleling two.
Disclosure: RV Battery Hub is reader-supported and may earn from qualifying links, at no extra cost to you. Comparisons are editorial.