Swapping your RV’s lead-acid battery for lithium is one of the best upgrades you can make: about a third of the weight, almost all the capacity usable, and thousands more charge cycles.
We compared the best-selling 12V 100Ah lithium (LiFePO4) batteries on Amazon from LiTime and Redodo, from $243 to $369. Each has the real price, what buyers report and one honest catch.
Disclosure: As an Amazon Associate we earn from qualifying purchases. Prices are what Amazon showed on October 10, 2026 and change often, so check today’s price before you buy. We haven’t tested these ourselves; the facts come from the listings, the makers and real buyer reviews.
At a glance
| Battery | Price | Rating | Size | Cold weather |
|---|---|---|---|---|
| Redodo 100Ah | $242.89 | 4.5★ (938) | Group 31, 22 lb | Not stated |
| LiTime 100Ah | $302.39 | 4.5★ (1,773) | Group 31, 22 lb | Not stated |
| LiTime Self-Heating | $368.99 | 4.7★ (653) | Group 24, 22.7 lb | Self-heating |
| LiTime Trolling | $335.99 | 4.7★ (596) | Group 31, 22 lb | Low-temp cut-off |
Our quick picks
- Cheapest 100Ah: Redodo 100Ah, $242.89
- Most proven: LiTime 100Ah, $302.39
- Best for cold weather camping: LiTime Self-Heating, $368.99
- Best for boats and trolling motors: LiTime Trolling, $335.99
Cold is the big catch with lithium. LiFePO4 batteries must not be charged below freezing (32°F). If you camp in cold weather, buy a self-heating battery or one with low-temperature charge protection, and keep it inside the heated part of the RV.
The 4 best lithium RV batteries on Amazon
1. Redodo 12V 100Ah LiFePO4 Battery (Group 31) $242.89
The cheapest proven 100Ah lithium battery here. Redodo says it uses automotive-grade LiFePO4 cells rated for 4,000 to 15,000 cycles, with a 100A BMS protecting against overcharge, over-discharge and short circuits.
Buyers call it an inexpensive lithium option that works: one says it reaches 100% in about 5 hours of full sun and runs 3 days without recharging, and it saves about 100 lb versus lead-acid.
- 12V 100Ah LiFePO4, 22 lb
- Fits a Group 31 battery box
- 100A BMS
- Up to 4 in series or parallel
The catch: No self-heating or Bluetooth at this price. Battery life reports are mixed: some get nearly 2 years, but some failed after about 7 months. Keep the receipt for the warranty.
Best for: Budget upgrades from lead-acid in mild climates.
2. LiTime 12V 100Ah LiFePO4 Battery (Group 31) $302.39
The most-reviewed lithium RV battery here, with over 1,700 ratings. LiTime claims a 10-year life and 15,000+ cycles, about 10 times longer than lead-acid, with a 100A BMS.
Buyers say it’s excellent quality, light and easy to install, and one notes it can draw over 100 amps with no problem.
- 12V 100Ah LiFePO4, 22 lb
- 100A BMS with full protection
- 15,000+ cycles claimed
- Group 31 size
The catch: Amazon’s summary mentions some defective units and batteries that won’t hold a charge. Test capacity soon after delivery while you can still return it.
Best for: A proven general-purpose RV or solar battery.
3. LiTime 12V 100Ah Self-Heating LiFePO4 Battery with Bluetooth $368.99
The one to buy if you camp in the cold. It heats itself below 41°F before charging, so you can charge from solar on frosty mornings, and Bluetooth lets you check the charge on your phone.
It fits a standard Group 24 box. Buyers say it lasts almost twice as long as AGM, cuts trailer tongue weight by about 60 lb, and the app is helpful and easy to use.
- Self-heating below 41°F (5°C), two heating modes
- Bluetooth 5.0 monitoring app
- Group 24 size, 22.7 lb
- Drop-in replacement for lead-acid
The catch: It’s the priciest single battery here, and self-heating uses some of the battery’s own energy in cold weather. A 2-pack is also sold.
Best for: Four-season RVers and cold-weather campers.
4. LiTime 12V 100Ah Trolling Motor LiFePO4 Battery $335.99
Built for boats but great in RVs too: it meets the ABYC E-13 marine standard with extra dust, water and salt-spray protection, and has built-in protection for 12V to 36V trolling motors.
Buyers call it the best choice, with one running a 12V fridge for five days and another fully charging it in two hours.
- ABYC E-13 marine standard
- Stops charging below 32°F, discharging below -4°F
- Group 31, 22 lb
- TVS protection for 12V to 36V motors
The catch: Low-temperature protection stops it from charging below freezing, but it won’t heat itself like the self-heating model.
Best for: Boats, kayaks and RVs near the water.
How long will a 100Ah lithium battery run your RV?
A 12V 100Ah LiFePO4 battery stores about 1,280Wh, and you can use roughly 90% of it. Divide by the watts you use: a 12V fridge averaging 20W, lights at 15W and a phone or laptop at 25W total about 60W, which is roughly 19 hours, or a day and a half with sensible use. Add solar to keep it topped up.
Running bigger appliances like a microwave or air conditioner? Pair your batteries with an inverter, or use a generator or power station.
Before you switch from lead-acid
- Check your RV converter or charger has a lithium (LiFePO4) charging profile; many older converters don’t.
- Your vehicle’s alternator may need a DC-DC charger to charge lithium safely.
- Match the battery size (Group 24 or 31) to your battery box.
- Don’t mix lithium and lead-acid batteries in the same bank.
Watch it on YouTube
Frequently asked questions
What is the best lithium battery for an RV?
The LiTime 12V 100Ah is the most proven here. For cold-weather camping, the LiTime Self-Heating ($368.99) is the best pick; on a budget, Redodo ($242.89) is the cheapest well-reviewed option.
Can lithium RV batteries be charged in freezing weather?
Not safely. LiFePO4 cells shouldn’t be charged below 32°F. Self-heating batteries warm themselves first; others with low-temp protection just stop charging.
Do I need a new converter for a lithium RV battery?
Often yes. Check that your converter or charger has a LiFePO4 profile; older lead-acid converters may not charge lithium fully.
How long do LiFePO4 batteries last?
Makers claim 4,000 to 15,000 cycles and around 10 years, far longer than lead-acid. Real life depends on depth of discharge, heat and charging.
Is a 100Ah lithium battery equal to a 200Ah lead-acid?
Roughly, in usable energy. You can use about 90% of a lithium battery but only about 50% of a lead-acid one without shortening its life.
Related guides
Watch us break these down on YouTube. We cover car gadgets, camping tech and new vehicles on The Hidden Secrets channel, always with the real price and the catch.
Sources
- Amazon: Redodo 12V 100Ah listing and review summary
- Amazon: LiTime 12V 100Ah Group 31 listing and review summary
- Amazon: LiTime Self-Heating 100Ah listing and review summary
- Amazon: LiTime Trolling Motor 100Ah listing and review summary
Featured image is an AI-styled scene built from the product’s Amazon photo; product photos are from Amazon listings.
