Buying Guide
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 Hardcastle's RV Editors
10 min read4 products evaluated
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.
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
- 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
The Practical Shortlist
A road-tested-thinking look at 4 options, organized around the job each one suits best.
Best Overall
WFCO Arterra WF-9865-AD-CB Converter/Charger - Deckmount - 65 Amp DC Output
Genuine upgrade for most trailers
Our take Check price for WFCO Arterra WF-9865-AD-CB Converter/Charger - Deckmount - 65 Amp DC Output (opens in a new tab)
Best for Big Banks
WFCO Genuine WF-9875-AD-CB RV Converter/Charger Deckmount 75Amp DC Output with Patented Auto Detect™ Technolog
Large lithium banks of 200Ah or more
Our take Check price for WFCO Genuine WF-9875-AD-CB RV Converter/Charger Deckmount 75Amp DC Output with Patented Auto Detect™ Technolog (opens in a new tab)
Best Budget
Upgrade Wf-8955an Power Converter with Recognition Lead Acid and Lithium Batteries - Rv Wf-8955-Ad-Mba 55 Amp
Old WF-8955 swaps on a budget
Our take Check price for Upgrade Wf-8955an Power Converter with Recognition Lead Acid and Lithium Batteries - Rv Wf-8955-Ad-Mba 55 Amp (opens in a new tab)
Alternate Budget
Upgrade Wf-8955 Power Converter with Recognition Lead Acid and Lithium Batteries - Quiet Cooling Wf-8955-Ad-Mb
A second budget WF-8955 option
Our take Check price for Upgrade Wf-8955 Power Converter with Recognition Lead Acid and Lithium Batteries - Quiet Cooling Wf-8955-Ad-Mb (opens in a new tab)
Why Each Pick Made the Cut
Best Overall1 of 4
WFCO Arterra WF-9865-AD-CB Converter/Charger - Deckmount - 65 Amp DC Output on Amazon (opens in a new tab)
Choose WFCO Arterra WF-9865-AD-CB Converter/Charger - Deckmount - 65 Amp DC Output for auto-Detect switches between lead acid and LiFePO4 on its own.
Best for
- Genuine upgrade for most trailers
Why it made the shortlist
WFCO Arterra WF-9865-AD-CB Converter/Charger - Deckmount - 65 Amp DC Output is positioned for Genuine upgrade for most trailers. The documented setup centers on 65A DC, 20A AC cord, auto-Detect lead acid or LiFePO4, full output down to 100V.
The feature doing most of the work here is auto-Detect switches between lead acid and LiFePO4 on its own. Against the other 3 picks, the useful comparison starts with 65A DC, 20A AC cord and auto-Detect lead acid or LiFePO4. Those details show whether its configuration suits the job better than a neighboring recommendation.
The practical constraint here is costs $233.00 more than third party swaps. 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
- 65A DC, 20A AC cord
- Auto-Detect lead acid or LiFePO4
- Full output down to 100V
Pros
- 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
Cons
- Costs $233.00 more than third party swaps
- Charge voltages are not shown in the listing
Best for Big Banks2 of 4
WFCO Genuine WF-9875-AD-CB RV Converter/Charger Deckmount 75Amp DC Output with Patented Auto Detect™ Technolog on Amazon (opens in a new tab)
WFCO Genuine WF-9875-AD-CB RV Converter/Charger Deckmount 75Amp DC Output with Patented Auto Detect™ Technolog makes the shortlist because ten extra amps fill big lithium banks faster than 65A.
Best for
- Large lithium banks of 200Ah or more
Why it made the shortlist
This model is aimed at Large lithium banks of 200Ah or more. The documented setup centers on 75A DC deckmount, auto-Detect lead acid or LiFePO4, uL, CSA, FCC listed.
The most useful documented advantage is ten extra amps fill big lithium banks faster than 65A. Against the other 3 picks, the useful comparison starts with 75A DC deckmount and auto-Detect lead acid or LiFePO4. Those details show whether its configuration suits the job better than a neighboring recommendation.
The main limitation to plan around is costs $40.00 more than the 65A WFCO. 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
- 75A DC deckmount
- Auto-Detect lead acid or LiFePO4
- UL, CSA, FCC listed
Pros
- 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
Cons
- Costs $40.00 more than the 65A WFCO
- Higher AC draw can strain a 30A shore cord
Best Budget3 of 4
Upgrade Wf-8955an Power Converter with Recognition Lead Acid and Lithium Batteries - Rv Wf-8955-Ad-Mba 55 Amp on Amazon (opens in a new tab)
The strongest case for Upgrade Wf-8955an Power Converter with Recognition Lead Acid and Lithium Batteries - Rv Wf-8955-Ad-Mba 55 Amp is switch selects lithium or lead acid mode manually.
Best for
- Old WF-8955 swaps on a budget
Why it made the shortlist
For Old WF-8955 swaps on a budget, this is one of the more relevant configurations in the shortlist. The documented setup centers on 55A DC output, lead acid and lithium switch, 105 to 130 VAC input.
Its case starts with switch selects lithium or lead acid mode manually. Against the other 3 picks, the useful comparison starts with 55A DC output and lead acid and lithium switch. Those details show whether its configuration suits the job better than a neighboring recommendation.
The trade-off worth checking first is not a genuine WFCO part, so support is unclear. 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 DC output
- Lead acid and lithium switch
- 105 to 130 VAC input
Pros
- Switch selects lithium or lead acid mode manually
- Cooling fan runs only when load needs it
- Drops into WF-8955 and Parallax 7155 slots
Cons
- Not a genuine WFCO part, so support is unclear
- Lithium voltage settings are not published
Alternate Budget4 of 4
Upgrade Wf-8955 Power Converter with Recognition Lead Acid and Lithium Batteries - Quiet Cooling Wf-8955-Ad-Mb on Amazon (opens in a new tab)
Upgrade Wf-8955 Power Converter with Recognition Lead Acid and Lithium Batteries - Quiet Cooling Wf-8955-Ad-Mb is the better fit when a second budget WF-8955 option.
Best for
- A second budget WF-8955 option
Why it made the shortlist
The intended use case is A second budget WF-8955 option. The documented setup centers on 55A DC, three stage charging, lead acid and lithium modes, electronic overload limiting.
What separates it on paper is three stage charging protects batteries from overcharge. Against the other 3 picks, the useful comparison starts with 55A DC, three stage charging and lead acid and lithium modes. Those details show whether its configuration suits the job better than a neighboring recommendation.
Before committing, account for not a genuine WFCO part, so support differs. 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 DC, three stage charging
- Lead acid and lithium modes
- Electronic overload limiting
Pros
- Three stage charging protects batteries from overcharge
- Overload shuts power down instead of overheating
- Quiet fan runs only when load requires it
Cons
- Not a genuine WFCO part, so support differs
- Lithium voltage stages are not documented
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.
What Matters Before You Choose a WFCO Converter Replacement For Lithium Batteries
Key buying criteria so you get the right fit the first time.
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.
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.
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.
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.
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.
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 |
Scroll sideways to see every column.
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.
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
Best overall: WFCO Arterra WF-9865-AD-CB Converter/Charger - Deckmount - 65 Amp DC Output — best overall pick in this roundup. See the full verdicts above for every pick, with pros, cons and who each one suits.
Browse all wfco converter replacement for lithium batteries on Amazon — Prime-eligible options with current pricing.