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[the evil twin]

Mmmmmmm, checked it just now again and still reading 12.28 although strangely enough its on 80% now according to the lights. Plugged it in for another charge as ET suggested and started reading 12.35 instantly. Will see what it reads later. Does appear to be discharging itself :-(

Yeah, let it sit on charge for a while.

Lithiums are a very different beast to Lead Acid.
For one thing they can't charge 'low' cells like a Lead Acid will IE once any Cell in series gets to max charge the charging flow virtually stops.
For that reason they have to have balancing circuits for the Cells.
Thats why some batteries of similar rating are more expensive and many manufacturers are selling versions they call "smart" as they have the circuits internal to the Battery.

Anyhooow... let the sucker sit there on charge for a while and see what you get.