Here is a simple way to make a battery holder (CR2025 etc.)
Use a wire to surround a toothpick several times and make a small loop to make the wire close contact to the battery.
Then use nylon ties to tie up both end.
U can cut the toothpick to the length u want.
U can also use popsicle instead of the toothpick.
The nylon ties can be reuse to make a new battery holder.
Step 1: Another Two Designs.
Just a references, both work nices.