The extra batteries are just one part of the equation.

Since they'll be getting lots of use, don't forget to bring extra batteries.

To power the No. 11 set extra batteries had to be carried by the radio vehicles.

Extra batteries should be bought in advance of any trip; they cost $2 each.

There were the flashlights and extra batteries, just where he'd left them.

Can hold an extra battery or second hard drive.

If I had to travel with plugs and extra batteries that would change things.

You should also carry your own backup flashlight and extra batteries.

Abruptly, the soldier by the door told Jerry that he had an extra battery.

In a kitchen drawer near the sink we found an extra battery, which proved to be fresh and strong.