Battery packs can be mounted on any smooth & flat location on the back or even the front of the headstock.
By means of clear Industrial Strength (translation: will NOT fall off!) tape that has been pre-secured to the bottom the pack.
Just peel and stick!

Simply snap in the battery to illuminate LEDs.

Snap the battery in reversed (180 degrees) for storage when not in use.
(Does not drain power while in the storage position)