WFCO 8735 Lithium Replacement

Updated 07/27/2025 | Published 04/02/2021

Question:

Why dont you carry the 8735 Lis? Is there a direct replacement for the WFCO by progressive that is an easy wire for wire job?

asked by: Keith A

Expert Reply:

We have the Progressive Dynamics Converter/Smart Charger at 35 Amp, # PD4135K. This is a replacement for WFCO WF-8735 that works with lithium-ion, flooded lead acid, AGM, and gel batteries. Please note the attached product review video and follow the link for full specs.

expert reply by: Michael R

Andy D.

7/25/2025

Hi, Does this Progressive Dynamic Charger # PD 4135K fit in the same mounting than the WF8735 P we have on our Sonic Lite. We like to change over to lithium and not worry about auto detect. Thanks for responding.

Robin H.

7/27/2025

@AndyD the PD4135K is designed to replace the 8735. The face dimensions are a little larger but it fits a 10-1/4" long x 7" tall cutout so I recommend comparing that to your existing cutout to double check.