[Daryles]

I have a 2019 3130re. The converter is a Progressive Dynamics PD4575K18LS8.
The model # is on a white sticker inside the circuit breaker panel door.
I upgrade to lithium batteries over a year ago without changing the converter. My converter is not lithium ready so I get about 80% charge from it.
However it does have a charge wizzard mode button and I used to manually set it to boost mode for four hours then it automatically reverts back to normal mode. This raises it to almost 100%.
Later I added two 200W of solar panels and a Victron 100/30 MPPT Charge controller. This is set to lithium mode and tops them off now to 100%.

As for getting the battery out of the battery box I had to struggle to get it out. Once it was removed I found 4 screws going down through the bottom of the battery box that held it in place.
You may find the hydraulics are mounted to a board and the board mounted to the frame. It may be easier to remove the screws mounting the board to get enough room to remove the batteries.