AA Equilateral Triangle

I carry a doorbell receiver with me around the house in order that the Aged P can contact me in case he suffers a mishap. Unfortunately it's not terribly reliable because the terminals of the AA batteries inside it are linked by a springy bit of wire which is not anchored to anything and it can easily slip out of place, so I have to keep fiddling with it and testing it.

The stablest shape is supposed to be triangular. If batteries were arranged in this shape, they could form a more straightforward circuit without needing to be either placed opposite each other or have an extra bit of wiring to loop the current round. It would mean they were less likely to become dislodged, make a simpler circuit, meaning less wiring, and easier to remove and insert without disturbing the other batteries one has just inserted.

This is a triangular battery compartment with the AA batteries forming the sides and conductive terminals at the corners.

It would also overcome the tendency to base everything on right angles, which would please the Skloodzi and the trups.