Hi Patrick. I came across your old post. Wondered if you figured out how to replace the charger since your post. I have the same issue with my new travel trailer and wondering how to upgrade to a lithium charger now that I purchased my lithium battery. It seems the charger and power center are integrated and I'm just looking for any info on whether it is possible to upgrade the charging unit. Appreciate any info you might have learned over the months. Thanks!