Replacing the Descent T1 Battery
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.
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Insert a coin or flat screwdriver into the slot
, and rotate counter-clockwise to unscrew the battery cap.
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Inspect both gaskets
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.