My notebook (t430s) has a main an a second battery. But the management is not battery specific. If one battery is 5% and the other 99% the system will still shut down (or what ever is defined in the -battery-generic- management interface) I wish I could define a 'main' battery the management relys on OR that I can define behavior for each battery on its own.
*** This bug has been marked as a duplicate of bug 329537 ***