Battery charger needs to have Lithium capability
Not sure what WFCO unit is installed. There are lithium models available. IE WF-8740-AD. Lithium batteries have a different charge profile from Lead Acid. They will go like 14.6volts to start. Additionally, a lithium battery will take as much current as you can give it to charge. You may need to look at wire size.
I bought a Renogy 100ah battery and I needed to change the wiring to #6 to be able to charge my battery within 2hrs off a Honda generator. (NP dry camping)
I schematic would help us help you.
My guess is the BMS in the battery is defective or not limiting the charge current.
Bob
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