Replacing the Descent T1 Battery

NOTICE

You should purchase a replacement battery only from a high-quality manufacturer and a reputable vendor. Using a low quality battery could result in poor product performance and reduced battery life, especially at low temperatures. Do not use rechargeable batteries. Rechargeable batteries may have a higher voltage specification and can cause permanent damage to the device.

To replace the battery, you need a coin or flat screwdriver, a new 3 V CR123A lithium battery, and waterproof silicone grease. You may also need a replacement battery cap accessory.

The transmitter is powered by a 3 V CR123A lithium battery. A battery is pre-installed at the factory. You must carefully follow the battery replacement instructions to preserve the transmitter's waterproofing.

  1. Insert a coin or flat screwdriver into the slot Callout number one, and rotate counter-clockwise to unscrew the battery cap.

    Exploded view of the battery installation with callouts
  2. Remove the battery cap and battery.
  3. Insert the new battery in the transmitter, with the positive pole facing into the transmitter and the negative pole facing the battery door.
  4. Inspect both gaskets Callout number two to verify they are clean, undamaged, and fully seated in the grooves.

    If the gaskets appear worn or damaged, you can purchase a replacement battery cap kit, including a cap, gaskets, and silicone grease. Go to the Descent™ T1 product page on garmin.com to purchase accessories.

  5. Apply a thin layer of waterproof silicone grease to both gaskets.
  6. Replace the battery cap into the transmitter, and fully tighten it.
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