PowerPax Tools Aviation Powerpax A9 Pack Battery Caddy, Holds 8 "AA" Batteries, 4 "AAA", and 1 9V Battery

AS easy to use as 1-2-3. Press on the bottom of the battery with your thumb to breach the locking tab, continue pushing the battery in the center opening, then twist out and pull battery out.

No more Loose Batteries!

Unique locking feature holds batteries firmly in place. Torison bars allow more flexibility and longer life of locking feature.