1.  I easily averaged three hours of battery life, and with an additional battery in the drive bay, I could have doubled that.

2.  Pilots like Glenn had to survive an additional battery of daunting tests.

3.  Last month, Toyota put on public display its new experimental fuel-cell vehicle, which has an additional battery for more efficient driving and storing of energy.

4.  Toyota Motor Corp. displayed its new experimental fuel-cell vehicle, which has an additional battery for more efficient driving and storing of energy.