Simple storage system for AA batteries that can be expanded and shaped as needed. Consists of a base module that can be combined with several by simply overlapping each other. 

Built-in "spring mechanism" to hold the battery in place. A battery can also stand upside down and, for example, indicate discharged or depleted. 

Designed to be easy to eject a battery with a finger from the bottom.

I wanted it to be a tight fit but if too tight simply scale it up a couple % before print.

Printed in PLA with 0.4mm nozzle, 0.20mm layer height, no support, no brim (although might be needed).

See also my AAA version