Replacement Smartwatch Battery, 3.8V, 390mAh

This replacement battery is engineered for the Amazfit T-Rex Pro smartwatch and delivers reliable power for extended outdoor and fitness applications. With a 390 mAh lithium-ion polymer capacity at 3.8V, this battery provides up to 18 days of typical use on a single charge, making it ideal for users who require extended wear without frequent recharging. Under heavy use conditions with continuous fitness tracking, heart rate monitoring, and active notifications, the battery delivers approximately 9 days of operation. For GPS-intensive activities, users can expect up to 40 hours of continuous tracking, while basic watch mode operation extends to approximately 66 days, depending on usage patterns. The battery charges rapidly through the device's magnetic 2-pin Pogo Pin dock connector in approximately 1 to 1.5 hours, minimizing downtime between uses. This replacement battery is designed as a direct compatible replacement, ensuring seamless integration with the Amazfit T-Rex Pro's rugged construction, which includes 10 ATM water resistance and military-grade durability standards. The durable lithium-ion polymer chemistry provides consistent performance across temperature ranges and usage scenarios typical of outdoor sports, fitness tracking, and industrial field work. This battery is an essential replacement component for professionals and active users who depend on their smartwatch for extended field operations, GPS navigation, health monitoring, and daily activity tracking without interruption.