Snap on battery cover for Dexcom G4 slim.

This thing allows for battery changes on the Dexcom G4 slim transmitter.

NB. This is version 1, let me know if you think it can be improved.

You'll need DIY skills to cut down (or mill flat) the G4 transmitter leaving 3.9 mm from the flat base.
Then remove old batteries, as per the YouTube video. (Do a search)
Clean the contacts well. I use a small rotating wire brush in a hand held hobby grinder.
I've found there's no need for solder if you spring out the bottom contacts and form the top ones into a curve so that they will be pressed down to contact by the cover.
Put in 2 new SR1120W batteries
Clip on the cover & seal with silicon rubber.

Test the voltage across the 2 contacts as per the Youtube video
Add a bead of silicon to make it waterproof if required, this would need cutting with a blade before the next change.

Subsequent battery changes will just be a matter of unclipping, changing the batteries and clipping the cover back in.