This is a generic, equivalent one, 100% compatible. This 3.7V 200mAh Replacement Li-Polymer battery is designed to compatible with Nest TL363844 Learning Thermostat 1st Generation.

Specifications:
* Product Type: generic/equivalent
* Battery Voltage: 3.7V
* Battery Capacity: 200mAh / 0.74Wh
* Chemistry: Li-Polymer
* Dimension: 44.30 x 34.90 x 3.90mm
* Condition: new, 1 Year Warranty!

Compatible with the following Models:
TL363844

Compatible Nest Models:
Learning Thermostat 1st Generation

Package Included:
1 x 3.7V 200mAh Replacement Li-Polymer Battery for Nest TL363844 Learning Thermostat 1st Generation