**Quick Fix:** To change the battery in your Dexcom G6 transmitter, grind away the plastic backing over the battery wells using a rotary tool, pop out the dead coin cells, insert two new SR726SW (396) batteries, and seal the unit watertight with epoxy.
### Required Tools and Materials
* **Rotary Tool (Dremel):** Fitted with a small engraving or carving bit.
* **Replacement Batteries:** Two (2) SR726SW (also sold as 396 or 397) silver oxide coin cells.
* **Precision Tweezers:** For prying out and positioning the batteries.
* **Watertight Sealant:** Clear, fast-curing epoxy or UV-curable resin.
* **Rubbing Alcohol:** For cleaning the device before and after.
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### Step-by-Step Replacement Guide
* **Step 1: Prep the Transmitter**
* Clean the transmitter thoroughly with rubbing alcohol.
* Place it backside-up (the flat side that normally clips into the sensor holder) on a stable workspace.
* **Step 2: Grind Open the Casing**
* Locate the two circular battery bumps on the back plastic of the transmitter.
* Using your rotary tool at a low speed, slowly grind away the plastic covering these bumps.
* Stop grinding immediately once you see the shiny metal surface of the old batteries to avoid damaging the internal circuit board.
* **Step 3: Remove the Dead Batteries**
* Slide precision tweezers under the edge of the old batteries.
* Gently pry them out of their wells, taking care not to bend or snap the delicate gold contact tabs underneath.
* **Step 4: Install the New Batteries**
* Clean any leftover plastic debris from the battery wells.
* Insert the two new SR726SW batteries with the **negative (-) side facing down** and the **positive (+) side facing up**.
* Ensure the metal contact tabs are firmly touching both the bottom and sides of the new batteries.
* **Step 5: Seal and Waterproof the Unit**
* Fill the excavated cavity completely with clear epoxy or UV resin.
* Smooth the epoxy so it sits perfectly flush with the original plastic backing (if it is too thick, the transmitter won’t click into the plastic G6 sensor holder).
* Allow the epoxy to cure fully (up to 24 hours depending on the brand) before exposing the transmitter to moisture.
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### Verifying the Fix
* Insert the transmitter back into a G6 sensor holder.
* Open your Dexcom G6 app or receiver.
* Initiate a transmitter search to verify successful pairing and a “full” battery status.
Recommended Fix
To change the battery in your Dexcom G6 transmitter, insert two new SR726SW (396) batteries, and seal the unit watertight
Two (2) SR726SW (also sold as 396 or 397) silver oxide coin cells..
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