【Compatible Model】: TL284443 Battery designed for Nest Learning Thermostat 2nd/3rd Gen, compatible with T3007ES, T3008US, T4000ES, A0013. 【Upgraded Battery】: This high-quality TL284443 Li-ion battery features advanced technology with a capacity of 1080mAh and voltage of 3.7V (3.99Wh), maintaining the same size as the original. It offers long-lasting performance starting from 0 cycles for maximum usage time. 【Security Certified】: The TL284443 Replacement Battery is CE and ROHS UL certified, ensuring over 1200 charge cycles. It includes a built-in microchip to prevent overcharging, over-discharging, short-circuiting, and overheating—providing multiple protections for safe operation. 【Use Instructions】: Fully charge the battery before first use. Optimal performance and longevity are achieved after 8 to 10 complete charge-discharge cycles. Ensure correct installation; instructional videos are available on YouTube. 【Great Service Guarantee】: For any questions or concerns post-installation, please feel free to contact us.

Give your Nest Learning Thermostat a new lease on life with this high-capacity TL284443 replacement battery.   Engineered to deliver extended performance and reliable power, this internal battery ensures your smart thermostat continues to maintain your home's comfort efficiently.

Key Features:

Precise Compatibility for Seamless Replacement:This battery is designed to be a direct replacement for the Nest Learning Thermostat 2nd and 3rd Generation, specifically compatible with models T3007ES, T3008US, T4000ES, and A0013.   Please verify your thermostat's model number before purchase to ensure a perfect fit.

Extended Performance with High Capacity:With a substantial capacity, this lithium-ion battery is built to support the extended operation of your thermostat.   It is designed to integrate smoothly, maintaining the same form factor as the original component for straightforward installation.

Built-in Safety Protections:Designed with user safety in mind, this battery incorporates protective features to help prevent issues such as overcharging and short circuits.   This focus on safety aims to provide peace of mind for homeowners.

Easy Installation & Optimal Setup:For best results, fully charge the battery before its first use.   To achieve optimal performance and battery longevity, it is recommended to complete several full charge-discharge cycles initially.   If you are unfamiliar with the installation process, refer to online video guides for assistance.

Note on Installation:Replacing the internal battery in a Nest Learning Thermostat requires careful handling.   If you are not comfortable with the process, seeking help from a professional is recommended to avoid damaging the device.