Solution to Replace WFCO 8735P to Charge Lithium Batteries
Updated 02/25/2026 | Published 08/15/2022
Question:
I have just installed a 200Amp hour lithium battery in our 2019 Aliner. I need to upgrade the WFCO 8735P convertor the a model that will charge Lithium batteries. I am considering the Progressive Dynamics PD4135K. Will this unit charge the battery from the tow vehicle? If not what are my options? Is there a power control center that has this ability incorporated into it? By the way, I also charge the battery using solar. Thanks for your help
asked by: Russ S
Expert Reply:
I have a solution for you because as you know what you have now cannot charge Lithium batteries. You will need the Progressive Dynamics # PD4135K which is designed to replace your WF-8735P and is compatible with Lithium batteries. When this is connected to your tow vehicle power source it will help charge the batteries. This will not interfere with your solar charging setup either.
Lee
7/17/2025
The converter has nothing to do with the tow vehicle. It is a 120V to 12V converter for running the camper and charging the battery. The reason the WFCO 8735P won't charge Lithium is because the lithium discharge voltage profile means the lithium battery voltage will be well above 12.8 v even when discharged, and the 8735P, thinking its a lead battery, will immediately go to float at 13.5 which will not charge lithium.
Jameson C.
7/17/2025
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Steven
1/25/2025
You said the 8735 p doesn’t charge lithium batteries but that manufacturer says it will. I would like a straight answer on this as I am consider lithium batteries as a change.