Apparently it is known for quite a while (read 6 years) that UPower has some problem with dual battery systems: https://bugs.freedesktop.org/show_bug.cgi?id=55278
** Bug watch added: freedesktop.org Bugzilla #55278 https://bugs.freedesktop.org/show_bug.cgi?id=55278 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1748747 Title: Laptop turns of when secondary battery is empty while main battery is still charged. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1748747/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
