Here is a satisfying modular battery holder I designed. 

HOW TO SELECT WHAT FILES TO PRINT

Mini Version

Print AAMiniBatteryHolder for AA battery clip and components. (Holds 10 Batteries)

Print AAAMiniBatteryHolder for AAA battery clip and components. (Holds 11 Batteries)

Regular Version

Print AARegularBatteryHolder for 2 AA battery clips and components. (20 batteries)

Print AAA RegularBatteryHolder for 2 AAA battery clips and components (22 batteries)

Print ComboRegularBatteryHolder for AA and AAA battery clips and components. (21 batteries)

Individual Replacement Components 

Print AABatteryClip for AA battery Clip only.

Print AAA BatteryClip For AAA battery Clip only.

If you need any other components to add, leave a comment and I will address it.