Richard,
Our 'Burb is used mostly for towing, it sits quite a bit.
I have 12v Jr connected thru a power port, the BT light shows green & rarely do I see 13v, usually 12.8.
Pretty much the same for the 6v, 'cept it's connected directly to the battery, with the negative cable off. I've seen a max chg voltage of 6.75. Un-plug and start over at 6.2.
Bob
