I've figured out that it happens for me either after resuming from suspension or after I've plugged into my adapter (both while plugged in and after I then remove it from the adapter it shows 2).
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/754255 Title: Battery applet shows 2 batteries -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs