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

4 Best WFCO Converter Replacement For Lithium Batteries in 2026: A Practical RV Guide

WFCO converter replacements for lithium batteries compared: two genuine Auto-Detect WFCO decks and two lithium-switch WF-8955 swaps, with charge checks.

By Bowen HigginsRV Editor at RV Gear Lab4 products comparedSpec-sheet researched

Swapping an old WFCO converter for a lithium friendly one is not just a plug in job. The old unit was tuned for lead acid, and a lithium bank needs the right absorption voltage, a clean float stage and a charger that does not choke on a low campground voltage. Four options are compared here, two genuine WFCO Auto-Detect decks and two WF-8955 style replacements with a lead acid and lithium switch, with notes on amps, fit and what the listings leave unstated.

RV Gear Lab field notes

The Rig Fit Check

Start with the job: WFCO Arterra WF-9865-AD-CB Converter/Charger - Deckmount - 65 Amp DC Output leads this shortlist for Genuine upgrade for most trailers. 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 65A DC, 20A AC cord, 75A DC deckmount, 55A DC output. Confirm the exact model and included components before ordering.
Trade-off to plan for: Costs $233.00 more than third party swaps

Before you buy

What Matters Before You Choose a WFCO Converter Replacement For Lithium Batteries

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

01
Lithium charge profile
Lithium wants a higher, flatter absorption voltage than lead acid and no desulfation stage. A lead acid profile can undercharge a bank. Look for a named LiFePO4 mode and ask the maker for the exact voltages.
02
Auto-detect or switch
An automatic unit picks the chemistry for you, while a switch can be left in the wrong place. A wrong mode shortens battery life. Check whether the listing says patented auto detect or a red switch.
03
Rated DC amps
The amp rating sets how fast a bank refills and how much load the unit covers. A 100Ah lithium bank can accept more than 50A, so a 55A unit gives a decent fill. Check the amp figure in the title.
04
Low voltage output
Campground power often sags to 105V or lower, and many converters cut output there. WFCO states full output down to 100 volts. Check the listing for a stated low voltage number.
05
Replacement fit
WFCO model numbers like WF-8955 and WF-9800 have different footprints and wiring. A mismatch means new brackets and cutting. Match the model number in the listing to the label on your old unit.

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 4 best wfco converter replacement for lithium batteries, explained

Best Overall · 1 of 4

WFCO Arterra WF-9865-AD-CB Converter/Charger - Deckmount - 65 Amp DC Output

65A DC, 20A AC cord
Auto-Detect lead acid or LiFePO4
Full output down to 100V

Check price on Amazon

Best for: Genuine upgrade for most trailers

Our take

It is $40.00 cheaper than the WFCO WF-9875 and $233.00 more than the Onylraep WF-8955 Replacement.

Why it made the shortlist

The WFCO Arterra WF-9865-AD-CB is a deckmount converter charger with a 65A DC output and a 20A AC power cord. Its patented Auto-Detect recognizes lead acid or LiFePO4 batteries and adjusts the charge profile. It holds full output power down to 100 volts and is UL and CSA listed.

For most 30A trailers 65A is plenty. Pick this if you want the genuine factory part with automatic lithium detection.

What works

Auto-Detect switches between lead acid and LiFePO4 on its own
Keeps full output power down to 100 volts AC
UL, CSA listed and FCC compliant

Watch out for

Costs $233.00 more than third party swaps
Charge voltages are not shown

Check price on Amazon

Best for Big Banks · 2 of 4

WFCO Genuine WF-9875-AD-CB RV Converter/Charger Deckmount 75Amp DC Output with Patented Auto Detect™ Technolog

75A DC deckmount
Auto-Detect lead acid or LiFePO4
UL, CSA, FCC listed

Check price on Amazon

Best for: Large lithium banks of 200Ah or more

Our take

It costs $40.00 more than the WFCO WF-9865 for 10 extra amps.

Why it made the shortlist

The WFCO WF-9875-AD-CB is a deckmount converter charger rated at 75A DC with the same patented Auto-Detect lead acid and LiFePO4 charging. It is UL, CSA and FCC listed.

Pick this if you have 200Ah or more of lithium and want faster charging.

What works

Ten extra amps fill big lithium banks faster than 65A
Auto-Detect picks the lithium profile with no switch
Full output holds down to 100 volts

Watch out for

Costs $40.00 more than the 65A WFCO
Higher AC draw can strain a 30A shore cord

Check price on Amazon

Best Budget · 3 of 4

Upgrade Wf-8955an Power Converter with Recognition Lead Acid and Lithium Batteries - Rv Wf-8955-Ad-Mba 55 Amp

55A DC output
Lead acid and lithium switch
105 to 130 VAC input

Check price on Amazon

Best for: Old WF-8955 swaps on a budget

Our take

At $71.99 it is $233.00 under the WFCO WF-9865 and is the same price as the Onylraep WF-8955 Replacement.

Why it made the shortlist

The zixixvan unit is a 55A replacement for the WF-8955 and Parallax 7155 converters, with a switch that selects lead acid or lithium mode and an automatic detection option. Input is 105 to 130 VAC at 60 Hz.

Pick this if you have an older WF-8955 and want lithium capability on a budget.

What works

Switch selects lithium or lead acid mode manually
Cooling fan runs only when load needs it
Drops into WF-8955 and Parallax 7155 slots

Watch out for

Not a genuine WFCO part, so support is unclear
Lithium voltage settings are not published

Check price on Amazon

Alternate Budget · 4 of 4

Upgrade Wf-8955 Power Converter with Recognition Lead Acid and Lithium Batteries - Quiet Cooling Wf-8955-Ad-Mb

55A DC, three stage charging
Lead acid and lithium modes
Electronic overload limiting

Check price on Amazon

Best for: A second budget WF-8955 option

Our take

It matches the zixixvan WF-8955 on price at $71.99, and it is $233.00 below the WFCO WF-9865.

Why it made the shortlist

The listing describes three stage charging and electronic current limiting that shuts down power during an overload. It is described as a simple replacement.

The listing text is nearly the same, so choose by seller reliability. Pick this if the zixixvan is out of stock or you prefer the overload shutdown.

What works

Three stage charging protects batteries from overcharge
Overload shuts power down instead of overheating
Quiet fan runs only when load requires it

Watch out for

Not a genuine WFCO part, so support differs
Lithium voltage stages are not documented

Check price on Amazon

Methodology

How We Built This Shortlist

Each pick was assessed across 4 criteria weighted for real-world use.

Lithium profile

We checked whether the listing names LiFePO4 charging and whether it is automatic or switch based.

Amp rating

Rated DC output was compared against common lithium bank sizes and charge rates.

Fit and swap

We looked at which WFCO model numbers each unit replaces and the mounting style.

Support and price

We weighed genuine WFCO support against the savings of third party swaps.

Decision guide

Match a WFCO Converter Replacement For Lithium Batteries to Your RV

By Lithium Bank Size

Your situation	Recommended pick	Why
100Ah lithium or smaller	zixixvan WF-8955	55A is plenty and costs $71.99
100Ah to 200Ah lithium	WFCO WF-9865	65A with Auto-Detect charging
200Ah or larger lithium	WFCO WF-9875	75A fills big banks faster
Same budget, second source	Onylraep WF-8955	Same 55A and lithium switch

By Budget

Budget	Recommended pick
$70 to $80	zixixvan WF-8955 or Onylraep WF-8955
$300 to $350	WFCO WF-9865 or WFCO WF-9875

Auto-Detect vs Manual Switch

Auto-Detect

WFCO WF-9865 and WFCO WF-9875 recognize lead acid or LiFePO4 on their own. That removes the chance of leaving the switch in the wrong mode.

Manual switch

zixixvan WF-8955 and Onylraep WF-8955 use a switch. They are cheaper but depend on you setting it correctly.

Default to Auto-Detect unless the price gap decides it.

By Existing Converter

Best pick	Recommended pick
Old WF-8955 or Parallax 7155	zixixvan WF-8955
Old WF-8955, want a second source	Onylraep WF-8955
Newer WFCO 9800 deck, mid size	WFCO WF-9865
Large trailer replacing a 75A unit	WFCO WF-9875

For Weak Campground Power Specifically

Look for

Stated full output at low AC voltage, such as 100 volts

In this comparison

Both WFCO WF-9865 and WFCO WF-9875 state full output down to 100 volts, which the WF-8955 style units do not state

When to Spend More

Spend more if

Spend more on the WFCO WF-9875 if your lithium bank is 200Ah or larger and you want faster charging on weak power.

Save if

Save with the zixixvan WF-8955 at $71.99 if your trailer has a small bank and an old WF-8955 deck.

FAQ

Before You Bring One Home

Can I put a lithium battery on my old WFCO converter?

Only if it has a lithium mode. A lead acid only converter can undercharge or overcharge lithium.

Is Auto-Detect really needed?

It is not required but avoids user error. A switch works if you remember to set it.

Is the WF-9875 overkill for a small bank?

Usually yes, since a small bank cannot accept 75A. Choose the 65A or 55A unit instead.

Do WF-8955 clones carry WFCO warranty?

No, they are third party. Support and warranty come from the seller, not WFCO.

Do I need to change wiring when swapping?

Check wire gauge and fuse size for the new amp rating. A larger converter may need a bigger fuse.

Bottom line

The short version

Browse more wfco converter replacement for lithium batteries 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.

4 Best WFCO Converter Replacement For Lithium Batteries in 2026: A Practical RV Guide

Our top picks

The Rig Fit Check

What Matters Before You Choose a WFCO Converter Replacement For Lithium Batteries

Lithium charge profile

Auto-detect or switch

Rated DC amps

Low voltage output

Replacement fit

Why You Can Trust RV Gear Lab

The 4 best wfco converter replacement for lithium batteries, explained

WFCO Arterra WF-9865-AD-CB Converter/Charger - Deckmount - 65 Amp DC Output

WFCO Genuine WF-9875-AD-CB RV Converter/Charger Deckmount 75Amp DC Output with Patented Auto Detect™ Technolog

Upgrade Wf-8955an Power Converter with Recognition Lead Acid and Lithium Batteries - Rv Wf-8955-Ad-Mba 55 Amp

Upgrade Wf-8955 Power Converter with Recognition Lead Acid and Lithium Batteries - Quiet Cooling Wf-8955-Ad-Mb

How We Built This Shortlist

Lithium profile

Amp rating

Fit and swap

Support and price

Match a WFCO Converter Replacement For Lithium Batteries to Your RV

By Lithium Bank Size

By Budget

Auto-Detect vs Manual Switch

By Existing Converter

For Weak Campground Power Specifically

When to Spend More

Before You Bring One Home

Can I put a lithium battery on my old WFCO converter?

Is Auto-Detect really needed?

Is the WF-9875 overkill for a small bank?

Do WF-8955 clones carry WFCO warranty?

Do I need to change wiring when swapping?

The short version

Bowen Higgins

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