Few things sap productivity more completely than a dead battery. It's an obvious point, but long battery life is only as useful as the person in charge of charging it. The unit includes a 6-cell 4400 mAh battery that's rated to deliver eight hours of continuous use, presumably with Panasonic's energy-saving software intact. In our tests, which force screen brightness to 100 percent but leave other settings alone, the Toughpad delivered three hours and 25 minutes of continuous media playback. If there's a need for longer periods on battery power, Toughpad accessories include a 9-cell 9300 mAh battery that's rated to provide more than 18 hours between charges. There's also a car-charging unit and a vehicle dock.