Where are you storing your batteries? Here is a quick and fun idea from Instructables user hagay1974. Hagay is using two scrap pieces of 2″ wide hook and loop strap to make fold on battery case which would probably fit any strap in the world.
Being a 4 seconds project, it totally qualifies for our Fastest Hack Ever certificate.
You start with 2 pieces of hook and loop, cut to wrap your specific battery.
And you end up with this nifty battery case (or smartphone case, or anything case) which you can take off any time.
For the full build head over to Hagai’s tutorial.