My demo t5010 is on the way, but I have a question in the meantime (I am the curious type). Does the modular bay battery discharge in parallel with the main battery, or does it discharge down to 0% first, then start discharging the main battery? Our old Fujitsus discharge in parallel, and I would rather they didn't. Our users are very mobile and don't get a chance to charge the batteries in the computer except at night. We use standalone chargers for the batteries so it would be preferable to keep the main battery charged and discharge only the bay battery. Otherwise the main battery ends up dead by the end of the day. We have an HP tablet that works this way and it is very convenient.