Buying Guide
5 Best Lithium RV Battery Conversion Kit in 2026: A Practical RV Guide
Five lithium RV conversion parts compared: one all-in-one kit, one battery and three lithium-safe converters, with honest notes on what each listing omits.
By Hardcastle's RV Editors
10 min read5 products evaluated
Converting an RV to lithium takes two things, a battery and a converter charger that holds about 14.6V. Most listings cover only one, so this guide compares an all-in-one kit, a 100Ah battery and three lithium-ready converters. Golf cart kits at 36V, 48V and 60V turned up in the search and were left out, because they are not 12V RV systems. Every row names what the listing proves and what it leaves out.
Hardcastleβs 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
- Redodo 12.8V 320Ah LiFePO4 Battery Kit 2000W Inverter w/MPPT & Chargers leads this shortlist for Full power system rebuilds. 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 12.8V 320Ah, 4096Wh, 12V 100Ah, Group 31, 55A, 120VAC to 12VDC. Confirm the exact model and included components before ordering.
- Trade-off to plan for
- Costs $1369.99, a large one time spend
The Practical Shortlist
A road-tested-thinking look at 5 options, organized around the job each one suits best.
Best Complete Kit
Redodo 12.8V 320Ah LiFePO4 Battery Kit 2000W Inverter w/MPPT & Chargers
Full power system rebuilds
Our take Check price for Redodo 12.8V 320Ah LiFePO4 Battery Kit 2000W Inverter w/MPPT & Chargers (opens in a new tab)
Best Battery Swap
Redodo 12V 100Ah LiFePO4 Battery
Swapping one lead acid battery
Our take Check price for Redodo 12V 100Ah LiFePO4 Battery (opens in a new tab)
Best Converter
CARMTEK RV Converter 55 Amp
Mixed or changing battery chemistries
Our take Check price for CARMTEK RV Converter 55 Amp (opens in a new tab)
Best for Higher Output
PowerMax PM4-60A 60A Deck Mount RV Converter Charger Lithium
Larger battery banks and heavy 12V loads
Our take Check price for PowerMax PM4-60A 60A Deck Mount RV Converter Charger Lithium (opens in a new tab)
Best Budget
ππππ ππ©π π«πππ WF-9855
WFCO WF-9800 series swaps
Our take Check price for ππππ ππ©π π«πππ WF-9855 (opens in a new tab)
Why Each Pick Made the Cut
Best Complete Kit1 of 5
Redodo 12.8V 320Ah LiFePO4 Battery Kit 2000W Inverter w/MPPT & Chargers on Amazon (opens in a new tab)
Redodo 12.8V 320Ah LiFePO4 Battery Kit 2000W Inverter w/MPPT & Chargers is the better fit when full power system rebuilds.
Best for
- Full power system rebuilds
Why it made the shortlist
The intended use case is Full power system rebuilds. The documented setup centers on 12.8V 320Ah, 4096Wh, 2000W inverter, 40A charger, 200A BMS, Bluetooth.
What separates it on paper is includes inverter, shore charger and MPPT solar controller. Its 12.8V 320Ah, 4096Wh specification sits at between the lower and upper ends of the comparable range in this 3-product comparison. Treat the battery platform and included charger as part of the fit, not just the headline number.
Before committing, account for costs $1369.99, a large one time spend. 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
- 12.8V 320Ah, 4096Wh
- 2000W inverter, 40A charger
- 200A BMS, Bluetooth
Pros
- Includes inverter, shore charger and MPPT solar controller
- 200A BMS supports a 2000W inverter load
- Bluetooth app shows battery status live
Cons
- Costs $1369.99, a large one time spend
- Package may arrive in several separate boxes
Best Battery Swap2 of 5
Redodo 12V 100Ah LiFePO4 Battery on Amazon (opens in a new tab)
Choose Redodo 12V 100Ah LiFePO4 Battery for drops into a Group 31 slot as a lead acid swap.
Best for
- Swapping one lead acid battery
Why it made the shortlist
Redodo 12V 100Ah LiFePO4 Battery is positioned for Swapping one lead acid battery. The documented setup centers on 12V 100Ah, Group 31, 22.58 lb, Bluetooth 5.0, charging stops below 32F.
The feature doing most of the work here is drops into a Group 31 slot as a lead acid swap. Its 12V 100Ah, Group 31 specification sits at the lower end of the comparable range in this 3-product comparison. Treat the battery platform and included charger as part of the fit, not just the headline number.
The practical constraint here is does not include any converter or charger. 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, Group 31
- 22.58 lb, Bluetooth 5.0
- Charging stops below 32F
Pros
- Drops into a Group 31 slot as a lead acid swap
- Charging stops below 32F to protect the cells
- Weighs 22.58 lb, about a third of AGM
Cons
- Does not include any converter or charger
- Needs a lithium capable charging source
Best Converter3 of 5
CARMTEK RV Converter 55 Amp on Amazon (opens in a new tab)
CARMTEK RV Converter 55 Amp makes the shortlist because adjustable 13V to 16.5V range covers lithium profiles.
Best for
- Mixed or changing battery chemistries
Why it made the shortlist
This model is aimed at Mixed or changing battery chemistries. The documented setup centers on 55A, 120VAC to 12VDC, 13V to 16.5V adjustable, lead acid and LiFePO4.
The most useful documented advantage is adjustable 13V to 16.5V range covers lithium profiles. Its 13V to 16.5V adjustable specification sits at the upper end of the comparable range in this 3-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 no exact lithium preset or warranty in the bullets. 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
- 55A, 120VAC to 12VDC
- 13V to 16.5V adjustable
- Lead acid and LiFePO4
Pros
- Adjustable 13V to 16.5V range covers lithium profiles
- Charges both lead acid and LiFePO4 batteries
- Lists six separate protections, including reverse polarity
Cons
- No exact lithium preset or warranty in the bullets
- Costs $89.91 more than the suplife WF-9855
Best for Higher Output4 of 5
PowerMax PM4-60A 60A Deck Mount RV Converter Charger Lithium on Amazon (opens in a new tab)
The strongest case for PowerMax PM4-60A 60A Deck Mount RV Converter Charger Lithium is 60A output is the highest of the converters here.
Best for
- Larger battery banks and heavy 12V loads
Why it made the shortlist
For Larger battery banks and heavy 12V loads, this is one of the more relevant configurations in the shortlist. The documented setup centers on up to 60A DC output, adjustable for lithium, deck mount, reverse polarity.
Its case starts with 60A output is the highest of the converters here. Against the other 4 picks, the useful comparison starts with up to 60A DC output and adjustable for lithium. Those details show whether its configuration suits the job better than a neighboring recommendation.
The trade-off worth checking first is lithium use needs manual voltage configuration. Confirm the exact model number and included components before ordering. Check dimensions, compatibility and maintenance needs against the way you plan to use and store it.
Key dimensions & specs
- Up to 60A DC output
- Adjustable for lithium
- Deck mount, reverse polarity
Pros
- 60A output is the highest of the converters here
- Lists current limiting and thermal protection
Cons
- Lithium use needs manual voltage configuration
- No warranty term appears in the bullets
Best Budget5 of 5
ππππ ππ©π π«πππ WF-9855 on Amazon (opens in a new tab)
ππππ ππ©π π«πππ WF-9855 is the better fit when wFCO WF-9800 series swaps.
Best for
- WFCO WF-9800 series swaps
Why it made the shortlist
The intended use case is WFCO WF-9800 series swaps. The documented setup centers on 55A, 950W, 14.6VDC, replaces WF-9800 series, 5 year warranty.
What separates it on paper is fixed 14.6V output matches LiFePO4 charging. Against the other 4 picks, the useful comparison starts with 55A, 950W, 14.6VDC and replaces WF-9800 series. Those details show whether its configuration suits the job better than a neighboring recommendation.
Before committing, account for fixed 14.6V is wrong for lead acid batteries. Confirm the exact model number and included components before ordering. Check dimensions, compatibility and maintenance needs against the way you plan to use and store it.
Key dimensions & specs
- 55A, 950W, 14.6VDC
- Replaces WF-9800 series
- 5 year warranty
Pros
- Fixed 14.6V output matches LiFePO4 charging
- Listed as a direct WF-9800 series replacement
- States a 5 year warranty on the converter
Cons
- Fixed 14.6V is wrong for lead acid batteries
- 55A output is the lowest here
How We Built This Shortlist
Each pick was assessed across 4 criteria weighted for real-world use.
- Lithium charge voltage
- We checked that each converter or kit charges at about 14.6V, or offers an adjustable range that reaches it.
- Kit completeness
- We compared what each listing includes, such as inverter, MPPT and DC-DC charger, versus a single part.
- BMS and output amps
- We read BMS current and converter amps to see what loads each setup can carry.
- Fit with existing gear
- We noted replacement compatibility, such as WF-9800 series, and what a buyer must still supply.
What Matters Before You Choose a Lithium RV Battery Conversion Kit
Key buying criteria so you get the right fit the first time.
Converter charge voltage
A lithium battery wants about 14.6V, and an old converter that tops out near 13.6V leaves it partly charged. Many converters also run a desulfation or equalization mode that can stress lithium cells. Look for a stated 14.6V output or a lithium mode in the listing.
Fixed versus adjustable output
A fixed 14.6V unit like the suplife WF-9855 is simple but suits only lithium. An adjustable unit like the CARMTEK 55A needs setup. Choose based on whether you will keep any lead acid battery.
BMS amps and inverter size
A 200A BMS can support a 2000W inverter, since 2000W at 12V is roughly 170A. A 100A BMS cannot. Match the BMS amps to your biggest load.
Cold charging protection
Charging lithium below freezing can damage cells. The Redodo 100Ah stops charging below 32F. Look for a stated cut off temperature, not just a general protection claim.
Direct fit versus rewiring
A direct replacement saves wiring work, as the suplife WF-9855 does for WF-9800 series boxes. A deck mount unit like the PowerMax 60A may need new mounting and cable runs. Check your current converter model before choosing.
Match a Lithium RV Battery Conversion Kit to Your RV
By Upgrade Scope
| Your situation | Recommended pick | Why |
|---|---|---|
| Replacing everything, adding solar | Redodo 320Ah Kit | Battery, inverter, shore charger, MPPT and DC-DC in one kit |
| Only swapping the battery | Redodo 100Ah | A Group 31 lithium drop in at $269.88 |
| Need a converter with adjustable voltage | CARMTEK 55A | 13V to 16.5V range at $169.90 |
| Replacing a WFCO WF-9800 converter | suplife WF-9855 | Listed as a direct WF-9800 series replacement at $79.99 |
Scroll sideways to see every column.
By Budget
| Budget | Recommended pick |
|---|---|
| $70 to $150 | suplife WF-9855 or PowerMax 60A |
| $160 to $270 | CARMTEK 55A or Redodo 100Ah |
| $1360 to $1370 | Redodo 320Ah Kit |
Fixed Voltage vs Adjustable Converter
- Fixed 14.6V
- The suplife WF-9855 outputs a fixed 14.6VDC, which is simple and right for lithium but wrong for lead acid.
- Adjustable
- The CARMTEK 55A and PowerMax 60A let you set a voltage range, which allows lead acid or lithium, but you must configure and verify it.
Default to the fixed suplife WF-9855 if you are going all lithium, and choose adjustable only for mixed banks.
By Charger Amps
| Best match | Recommended pick |
|---|---|
| Up to 55A needed | suplife WF-9855 |
| Want 55A with a wider voltage range | CARMTEK 55A |
| Want 60A for a larger bank | PowerMax 60A |
| Want 40A shore charging plus solar | Redodo 320Ah Kit |
For Replacing Lead Acid in a Travel Trailer Specifically
- Look for
- A converter that holds about 14.6V and a battery with low temperature charge cut off.
- In this comparison
- The Redodo 100Ah supplies the battery with a 32F charge stop, and the suplife WF-9855 at $79.99 supplies the 14.6V charge, together $349.87.
When to Spend More
- Spend more if
- Spend $1369.99 on the Redodo 320Ah Kit if you also want an inverter and solar controller, or $169.90 on the CARMTEK 55A for an adjustable voltage window.
- Save if
- Save with the suplife WF-9855 at $79.99 if you have a WF-9800 series box, and pair it with the Redodo 100Ah at $269.88.
Before You Bring One Home
Do I need a new converter for a lithium battery?
Often yes, if your converter caps near 13.6V or runs a lead acid only profile. A lithium capable unit charges fully and avoids early shutoff.
Are golf cart conversion kits usable in an RV?
No, they are 36V, 48V or 60V systems, while most RVs run 12V. They are not interchangeable.
Can I keep my existing lead acid battery with a CARMTEK 55A?
The listing says it supports both chemistries, but you must set the right voltage window for each. Do not mix chemistries in one bank.
Is the Redodo 320Ah Kit overkill for a small trailer?
Often yes, since 4096Wh and a 2000W inverter exceed light loads. A 100Ah battery with a lithium converter is cheaper for a weekend trailer.
Bottom Line
Best overall: Redodo 12.8V 320Ah LiFePO4 Battery Kit 2000W Inverter w/MPPT & Chargers β best complete kit pick in this roundup. See the full verdicts above for every pick, with pros, cons and who each one suits.
Browse all lithium rv battery conversion kit on Amazon β Prime-eligible options with current pricing.