Buying Guide
5 Best Group 31 Lithium RV Battery in 2026: A Practical RV Guide
Group 31 lithium RV battery picks compared on 100Ah to 165Ah capacity, self heating, low temperature cutoffs, and weight versus lead acid.
By Hardcastle's RV Editors
10 min read5 products evaluated
Group 31 is the biggest common RV battery case, about 13 inches long, so lithium here can reach 165Ah in one box. The tradeoffs are cold handling, because a self heating model can charge in freezing weather while the rest stop, and weight, with 22 to 24 lb versus roughly a third of lead acid. These five were compared on capacity, cold behavior and price per battery.
Hardcastle’s RV field notes
The Rig Fit Check
A quick way to connect the shortlist to the space, workload and ownership details that matter after the box arrives.
- Start with the job
- Litime 12V 165Ah LiFePO4 Battery leads this shortlist for cold weather and boondocking. Use that fit as a reference point, then compare the alternatives against your own space and workload.
- Specs that separate the picks
- The first details to compare are 12V 165Ah LiFePO4, 12V 100Ah LiFePO4. Confirm the exact model and included components before ordering.
- Trade-off to plan for
- Costs $177.60 more than the 100Ah Litime
The Practical Shortlist
A road-tested-thinking look at 5 options, organized around the job each one suits best.
Best Overall
Litime 12V 165Ah LiFePO4 Battery
cold weather and boondocking
Our take Check price for Litime 12V 165Ah LiFePO4 Battery (opens in a new tab)
Best Overall Value
Litime 12V 100Ah LiFePO4 Battery
known brand drop in with clear dimensions
Our take Check price for Litime 12V 100Ah LiFePO4 Battery (opens in a new tab)
Best Value Single
Power Queen 12V 100Ah Group 31 LiFePO4 Lithium Battery for RV
buyers comparing capacity, compatibility, included components and storage needs
Our take Check price for Power Queen 12V 100Ah Group 31 LiFePO4 Lithium Battery for RV (opens in a new tab)
Best for Two Battery Bank
2-Pack 12V 100Ah LiFePO4 Lithium Battery Group 31 Built-in 100A BMS
200Ah bank on a tight budget
Our take Check price for 2-Pack 12V 100Ah LiFePO4 Lithium Battery Group 31 Built-in 100A BMS (opens in a new tab)
Best Budget
12V 100Ah LiFePO4 Lithium Battery Group 31 Low-Temp Protection Built-in 100A BMS
cheapest single Group 31 lithium
Our take Check price for 12V 100Ah LiFePO4 Lithium Battery Group 31 Low-Temp Protection Built-in 100A BMS (opens in a new tab)
Why Each Pick Made the Cut
Best Overall1 of 5
Litime 12V 165Ah LiFePO4 Battery on Amazon (opens in a new tab)
The strongest case for Litime 12V 165Ah LiFePO4 Battery is self heating allows charging in freezing weather.
Best for
- cold weather and boondocking
Why it made the shortlist
For cold weather and boondocking, this is one of the more relevant configurations in the shortlist. The documented setup centers on 12V 165Ah LiFePO4, self heating, 2 modes, 172.3Wh/L energy density.
Its case starts with self heating allows charging in freezing weather. Its 12V 165Ah LiFePO4 specification sits at the same documented level as the comparable picks in this 5-product comparison. Treat the battery platform and included charger as part of the fit, not just the headline number.
The trade-off worth checking first is costs $177.60 more than the 100Ah Litime. Confirm whether the battery and charger are included with the exact package. Check platform compatibility and published runtime against the area or workload you need to cover.
Key dimensions & specs
- 12V 165Ah LiFePO4
- Self heating, 2 modes
- 172.3Wh/L energy density
Pros
- Self heating allows charging in freezing weather
- 165Ah holds about 2100Wh in one case
- Bluetooth password blocks others from pairing
Cons
- Costs $177.60 more than the 100Ah Litime
- Heating draws some of its own stored energy
Best Overall Value2 of 5
Litime 12V 100Ah LiFePO4 Battery on Amazon (opens in a new tab)
Litime 12V 100Ah LiFePO4 Battery is the better fit when known brand drop in with clear dimensions.
Best for
- known brand drop in with clear dimensions
Why it made the shortlist
The intended use case is known brand drop in with clear dimensions. The documented setup centers on 12V 100Ah LiFePO4, 22.16 lb, 13 in long, 20+ BMS protections.
What separates it on paper is listed weight and dimensions make fitting simple. Its 12V 100Ah LiFePO4 specification sits at the same documented level as the comparable picks in this 5-product comparison. Treat the battery platform and included charger as part of the fit, not just the headline number.
Before committing, account for costs $50.40 more than the Power Queen. Confirm whether the battery and charger are included with the exact package. Check platform compatibility and published runtime against the area or workload you need to cover.
Key dimensions & specs
- 12V 100Ah LiFePO4
- 22.16 lb, 13 in long
- 20+ BMS protections
Pros
- Listed weight and dimensions make fitting simple
- 20 plus BMS safeguards include overcharge protection
- Automotive grade cells for long life
Cons
- Costs $50.40 more than the Power Queen
- No self heating for freezing charge
Best Value Single3 of 5
Power Queen 12V 100Ah Group 31 LiFePO4 Lithium Battery for RV on Amazon (opens in a new tab)
Choose Power Queen 12V 100Ah Group 31 LiFePO4 Lithium Battery for RV for 100A BMS covers overcharge and short circuit.
Best for
- buyers comparing capacity, compatibility, included components and storage needs
Why it made the shortlist
Power Queen 12V 100Ah Group 31 LiFePO4 Lithium Battery for RV is positioned for buyers comparing capacity, compatibility, included components and storage needs. The documented setup centers on 12V 100Ah LiFePO4, 100A BMS, 24 lb Group 31.
The feature doing most of the work here is 100A BMS covers overcharge and short circuit. Its 12V 100Ah LiFePO4 specification sits at the same documented level as the comparable picks in this 5-product comparison. Treat the battery platform and included charger as part of the fit, not just the headline number.
The practical constraint here is heavier than the Litime by about 2 lb. Confirm whether the battery and charger are included with the exact package. Check platform compatibility and published runtime against the area or workload you need to cover.
Key dimensions & specs
- 12V 100Ah LiFePO4
- 100A BMS
- 24 lb Group 31
Pros
- 100A BMS covers overcharge and short circuit
- About a third of lead acid weight
- Cheaper than the Litime with similar capacity
Cons
- Heavier than the Litime by about 2 lb
- No self heating for charging in freezing weather
Best for Two Battery Bank4 of 5
2-Pack 12V 100Ah LiFePO4 Lithium Battery Group 31 Built-in 100A BMS on Amazon (opens in a new tab)
2-Pack 12V 100Ah LiFePO4 Lithium Battery Group 31 Built-in 100A BMS makes the shortlist because low temperature cutoff protects the cells.
Best for
- 200Ah bank on a tight budget
Why it made the shortlist
This model is aimed at 200Ah bank on a tight budget. The documented setup centers on 2 x 12V 100Ah LiFePO4, 100A BMS, low temp cutoff, 22.48 lb each.
The most useful documented advantage is low temperature cutoff protects the cells. Its 2 x 12V 100Ah LiFePO4 specification sits at the same documented level as the comparable picks in this 5-product comparison. Treat the battery platform and included charger as part of the fit, not just the headline number.
The main limitation to plan around is ships as separate boxes per battery. Confirm whether the battery and charger are included with the exact package. Check platform compatibility and published runtime against the area or workload you need to cover.
Key dimensions & specs
- 2 x 12V 100Ah LiFePO4
- 100A BMS, low temp cutoff
- 22.48 lb each
Pros
- Low temperature cutoff protects the cells
- Listed dimensions and weight help planning
Cons
- Ships as separate boxes per battery
- Brand is less established than Litime
Best Budget5 of 5
12V 100Ah LiFePO4 Lithium Battery Group 31 Low-Temp Protection Built-in 100A BMS on Amazon (opens in a new tab)
The strongest case for 12V 100Ah LiFePO4 Lithium Battery Group 31 Low-Temp Protection Built-in 100A BMS is stated -4F discharge cutoff is clear.
Best for
- cheapest single Group 31 lithium
Why it made the shortlist
For cheapest single Group 31 lithium, this is one of the more relevant configurations in the shortlist. The documented setup centers on 12V 100Ah LiFePO4, cuts off discharge below -4F, 100A BMS, A+ cells.
Its case starts with stated -4F discharge cutoff is clear. Its 12V 100Ah LiFePO4 specification sits at the same documented level as the comparable picks in this 5-product comparison. Treat the battery platform and included charger as part of the fit, not just the headline number.
The trade-off worth checking first is 15000 cycle claim is unverified by the listing. Confirm whether the battery and charger are included with the exact package. Check platform compatibility and published runtime against the area or workload you need to cover.
Key dimensions & specs
- 12V 100Ah LiFePO4
- Cuts off discharge below -4F
- 100A BMS, A+ cells
Pros
- Stated -4F discharge cutoff is clear
- 100A BMS with temperature control and protection
Cons
- 15000 cycle claim is unverified by the listing
- Charging below freezing is not detailed
How We Built This Shortlist
Each pick was assessed across 4 criteria weighted for real-world use.
- Capacity and energy
- We compared amp hours and converted to watt hours, since 165Ah holds about 2100Wh.
- Cold weather behavior
- We looked for self heating, low temperature cutoffs and stated thresholds.
- Weight and fit
- We checked listed weight near 22 to 24 lb and dimensions near 13 inches.
- Price per battery
- We divided pack prices so singles and pairs compare fairly.
What Matters Before You Choose a Group 31 Lithium RV Battery
Key buying criteria so you get the right fit the first time.
Watt hours across sizes
A 165Ah battery holds about 2100Wh against 1280Wh for 100Ah, so one large battery can replace two small ones. That also saves wiring and a BMS. Multiply amp hours by 12.8 to compare.
Self heating vs low temp cutoff
Standard LiFePO4 stops charging near 32F to protect its cells. Self heating warms the cells so charging continues. Check for heating or a stated cutoff threshold.
Group 31 dimensions
Group 31 is about 13 inches long, and Litime lists 13 x 6.77 x 9.08 while GRNOE lists 12.9 x 6.7 x 8.6. A half inch matters in a tray. Measure first.
BMS rating
A 100A BMS limits continuous current, which matters if you run an inverter. Most listed here are 100A. Check the continuous discharge number.
Weight versus lead acid
Lithium Group 31 weighs 22 to 24 lb, roughly a third of lead acid. That matters for tongue weight and handling. Check the listed weight.
Match a Group 31 Lithium RV Battery to Your RV
By Capacity Need
| Your situation | Recommended pick | Why |
|---|---|---|
| Maximum energy in one case | Litime 165Ah Heated | 165Ah, about 2100Wh |
| Standard 100Ah swap, known brand | Litime 100Ah | Listed size and weight |
| Standard 100Ah, mid price | Power Queen 100Ah | $251.99 |
| 200Ah bank, lowest cost | GRNOE 2-Pack | $164.95 each |
Scroll sideways to see every column.
By Budget
| Budget | Recommended pick |
|---|---|
| $160 to $260 | Balanergy 100Ah or Power Queen 100Ah |
| $300 to $330 | Litime 100Ah or GRNOE 2-Pack |
| $470 to $480 | Litime 165Ah Heated |
Heated vs Standard
- Self heating
- Charges in freezing weather by warming its own cells. Only the Litime 165Ah Heated offers this here.
- Standard
- Stops charging near freezing, but costs far less. Litime 100Ah, Power Queen 100Ah, GRNOE 2-Pack and Balanergy 100Ah are standard.
Most buyers should default to standard unless winter charging is a real need.
By Budget
| Best pick | Recommended pick |
|---|---|
| Under $200 | Balanergy 100Ah |
| Around $250 | Power Queen 100Ah |
| Around $300 | Litime 100Ah |
| Around $480 for heated | Litime 165Ah Heated |
For Winter Camping Specifically
- Look for
- Self heating or an explicit low temperature charge cutoff, plus a listed discharge limit.
- In this comparison
- The Litime 165Ah Heated heats itself, and the Balanergy 100Ah states a -4F discharge cutoff, but only the Litime can charge in a freeze.
When to Spend More
- Spend more if
- Spend more on the Litime 165Ah Heated at $479.99 for winter use, since a standard battery stops charging in a freeze.
- Save if
- Save with the Balanergy 100Ah at $169.99 or the GRNOE 2-Pack at $329.90 if you camp in mild weather.
Before You Bring One Home
Is Group 31 too big for my RV?
Measure the tray first. Group 31 is about 13 inches long and 9 inches tall.
Do I need self heating?
Only if you charge below freezing. Otherwise a standard battery is fine.
Can I wire two in parallel?
Yes, matched batteries can be paralleled. The GRNOE and Litime packs are sold for that.
Is lithium worth it over lead acid?
For house power, yes, because most of the rating is usable and weight drops about two thirds.
Bottom Line
Best overall: Litime 12V 165Ah LiFePO4 Battery — best overall pick in this roundup. See the full verdicts above for every pick, with pros, cons and who each one suits.
Browse all group 31 lithium rv battery on Amazon — Prime-eligible options with current pricing.