Buying guide · 10 min read · Updated October 2, 2026

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 Bowen HigginsRV Editor at RV Gear Lab5 products comparedSpec-sheet researched

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.

RV Gear Lab field notes

The Rig Fit Check

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

Before you buy

What Matters Before You Choose a Lithium RV Battery Conversion Kit

Key buying criteria so you get the right fit the first time.

01
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.
02
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.
03
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.
04
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.
05
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.

Our standards

Why You Can Trust RV Gear Lab

At RV Gear Lab, we compare products based on rig fit and power or hookup compatibility, verified specifications, usability, setup requirements, weight, durability, and real-world trade-offs. We do not rank products purely on marketing claims or commission rates.

We have not personally tested every product listed. Where hands-on testing is not available, recommendations are based on verified manufacturer specifications, product documentation, use-case fit, and comparative research.

How we review RV gear →

Detailed reviews

The 5 best lithium rv battery conversion kit, explained

Best Complete Kit · 1 of 5

Redodo 12.8V 320Ah LiFePO4 Battery Kit 2000W Inverter w/MPPT & Chargers

12.8V 320Ah, 4096Wh
2000W inverter, 40A charger
200A BMS, Bluetooth

Check price on Amazon

Best for: Full power system rebuilds

Our take

Pick this if you are rebuilding the whole power system.

Why it made the shortlist

The Redodo 320Ah Kit bundles a 12.8V 320Ah LiFePO4 battery (4096Wh), a 2000W pure sine inverter, a 14.6V 40A shore charger, a 12/24V 40A MPPT solar controller and a 12V 40A DC-DC charger. It adds a 200A BMS, Bluetooth 5.0 and an IP65 housing.

What works

Includes inverter, shore charger and MPPT solar controller
200A BMS supports a 2000W inverter load
Bluetooth app shows battery status live

Watch out for

Costs $1369.99, a large one time spend
Package may arrive in several separate boxes

Check price on Amazon

Best Battery Swap · 2 of 5

Redodo 12V 100Ah LiFePO4 Battery

12V 100Ah, Group 31
22.58 lb, Bluetooth 5.0
Charging stops below 32F

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Best for: Swapping one lead acid battery

Our take

Pick this if your RV converter is already lithium ready or you will add one.

Why it made the shortlist

The Redodo 100Ah is a single Group 31 12V LiFePO4 battery at 22.58 lb with Bluetooth 5.0 monitoring and 20+ protections. It stops charging below 32F, and the listing cites 4000+ cycles at 100% depth of discharge and a 10 year lifespan.

What works

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

Watch out for

Does not include any converter or charger
Needs a lithium capable charging source

Check price on Amazon

Best Converter · 3 of 5

CARMTEK RV Converter 55 Amp

55A, 120VAC to 12VDC
13V to 16.5V adjustable
Lead acid and LiFePO4

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Best for: Mixed or changing battery chemistries

Our take

At $169.90 it costs $89.91 more than the suplife WF-9855 and $24.90 more than the PowerMax 60A.

Why it made the shortlist

The CARMTEK 55A converts 120VAC to 12VDC with a 13V to 16.5V adjustable operating range and charges both lead acid and LiFePO4. It lists multi-stage charging with short circuit, overload, over-temperature, under-voltage, over-voltage and reverse polarity protection.

Pick this if you want a stated adjustable voltage window to set a lithium charge profile.

What works

Adjustable 13V to 16.5V range covers lithium profiles
Charges both lead acid and LiFePO4 batteries
Lists six separate protections, including reverse polarity

Watch out for

No exact lithium preset or warranty in the listing
Costs $89.91 more than the suplife WF-9855

Check price on Amazon

Best for Higher Output · 4 of 5

PowerMax PM4-60A 60A Deck Mount RV Converter Charger Lithium

Up to 60A DC output
Adjustable for lithium
Deck mount, reverse polarity

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Best for: Larger battery banks and heavy 12V loads

Our take

At $145 it is $24.90 under the CARMTEK 55A and $65.01 above the suplife WF-9855, with 5 more amps than the CARMTEK.

Why it made the shortlist

The PowerMax PM4-60A is a deck mount converter charger delivering up to 60 amps of regulated 12V. It lists smart multi-stage charging, adjustable output for properly configured lithium charging, and current limiting, reverse polarity and thermal protection.

Pick this if you have a bigger battery bank or a lot of 12V load.

What works

60A output is the highest of the converters here
Lists current limiting and thermal protection

Watch out for

Lithium use needs manual voltage configuration
No warranty term appears in the listing

Check price on Amazon

Best Budget · 5 of 5

𝟐𝟎𝟐𝟔 𝐔𝐩𝐠𝐫𝐚𝐝𝐞 WF-9855

55A, 950W, 14.6VDC
Replaces WF-9800 series
5 year warranty

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Best for: WFCO WF-9800 series swaps

Our take

At $79.99 it is $89.91 under the CARMTEK 55A and $65.01 under the PowerMax 60A.

Why it made the shortlist

The suplife WF-9855 is a 55 amp, 950 watt RV power converter outputting 14.6VDC with three-stage charging, listed as a replacement for WF-9855, WF-9855-AD and other WF-9800 series units. It lists a pure copper silent fan, overcharge, overvoltage, high temperature and short circuit protection, and a 5 year warranty.

Pick this if you have a WFCO WF-9800 series box and want a direct lithium capable swap.

What works

Fixed 14.6V output matches LiFePO4 charging
Listed as a direct WF-9800 series replacement
States a 5 year warranty on the converter

Watch out for

Fixed 14.6V is wrong for lead acid batteries
55A output is the lowest here

Check price on Amazon

Methodology

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.

Decision guide

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

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.

FAQ

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

The short version

Browse more lithium rv battery conversion kit on Amazon →

About the author

Bowen Higgins

RV Editor at RV Gear Lab

Bowen covers RV power, water systems, towing and leveling, upkeep and interior comfort, with a focus on matching gear to the rig, the hookups and the way you actually travel.

5 Best Lithium RV Battery Conversion Kit in 2026: A Practical RV Guide

Our top picks

The Rig Fit Check

What Matters Before You Choose a Lithium RV Battery Conversion Kit

Converter charge voltage

Fixed versus adjustable output

BMS amps and inverter size

Cold charging protection

Direct fit versus rewiring

Why You Can Trust RV Gear Lab

The 5 best lithium rv battery conversion kit, explained

Redodo 12.8V 320Ah LiFePO4 Battery Kit 2000W Inverter w/MPPT & Chargers

Redodo 12V 100Ah LiFePO4 Battery

CARMTEK RV Converter 55 Amp

PowerMax PM4-60A 60A Deck Mount RV Converter Charger Lithium

𝟐𝟎𝟐𝟔 𝐔𝐩𝐠𝐫𝐚𝐝𝐞 WF-9855

How We Built This Shortlist

Lithium charge voltage

Kit completeness

BMS and output amps

Fit with existing gear

Match a Lithium RV Battery Conversion Kit to Your RV

By Upgrade Scope

By Budget

Fixed Voltage vs Adjustable Converter

By Charger Amps

For Replacing Lead Acid in a Travel Trailer Specifically

When to Spend More

Before You Bring One Home

Do I need a new converter for a lithium battery?

Are golf cart conversion kits usable in an RV?

Can I keep my existing lead acid battery with a CARMTEK 55A?

Is the Redodo 320Ah Kit overkill for a small trailer?

The short version

Bowen Higgins

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