Randy, we have a PD4575. We switched to lithium batteries 4 years ago but still have the original converter.
No it doesn't have a lithium switch BUT,
you do have a Charge Wizard that puts out 14.4vdc in boost mode.
Before we go boondocking (or running the generator while boondocking) I put the converter into boost mode to get a full charge or (90%).
The solar (800w) and MPPT (set to lithium) tops them off.
https://www.progressivedyn.com/power-converters-2/
https://www.progressivedyn.com/wp-co...rd-Pendant.pdf
The Charge Wizard Operation
While the built-in Charge Wizard automatically determines which operating mode is best suited to recharge or maintain optimum battery condition, the Wizard Mode Button allows for manual override and has indicator light(s) to indicate the mode of operation.
NOTE: The Green LED on the left refers to the Charge Wizard - the Red LED on the right was for the Charge Sentinel (supplied on converters built prior to year 2000)
BOOST MODE Indicated by green LED remaining on. The output voltage is 14.4VDC to rapidly recharge the battery up to 90% of full charge.
NORMAL MODE When the battery is between 50% and 90% charged, the green LED will flash once per second. When the battery has reached
90% of full charge the green LED will flash 2 - 3 times per second. In this mode the output voltage is 13.6VDC and the*converter*is safely completing
the charge of the battery.
STORAGE MODE Indicated by green LED flashing every 6 - 8 seconds. In this mode the output voltage has been lowered to 13.2VDC, the RV
battery is fully charged and the*converter*is maintaining the charge.
MANUAL BUTTON - The manual button has been provided to allow the operator to temporarily override the*converter*(not recommended) or to
verify the*converter*is operating properly. For manual operation, Press and Hold the button. The indicator light will soon remain ON indicating Boost
Mode. Continue to hold the button and the light will blink rapidly indicating the*converter*is in the Normal Mode. Continue to hold the button until the
light blinks slowly indicating the*converter*is now in the Storage Mode. After the manual button is released the*converter*will stay in the selected mode. When the battery charge status changes, the*converter*will return to the automatic mode of operation to prevent damage to the battery.