I don't know much about that solar CC, but here is a resource
@Steve_S did about configuring a Midnight Classic for use with a Lithium battery.
If you haven't looked at the resources before .... Once you get to the page, click on the download link for access to the documents.
I am posting this info which s directly from Midnite Solar posted in their Suppor FAQ's. It is a little "dated" but they are not the fastest company out there to make changes. Hope it helps fellow Midnite Classic & KID Users. Material Source...
diysolarforum.com