Additional Details ------------------------------ Bullet point: [Battery Compatible] Replacement Battery for Learning Thermostat T200377, Learning Thermostat T200477, Learning Thermostat T200577, Learning Thermostat T200777, Learning Thermostat T200877, T200377, T200477, T200577, T200777, T200877 . All batteries are Certificated with ISO9001, RoHS, and CE. Product description: Cameron Sino Cameron Sino is a brand focusing on sell battery? With tens of thousands of batteries. Fit Modelr for: Learning Thermostat T200377, Learning Thermostat T200477, Learning Thermostat T200577, Learning Thermostat T200777, Learning Thermostat T200877, T200377, T200477, T200577, T200777, T200877 Part Number for: 3701-0001-01, P11GY1-01-S01 Notice Before Purchase - Be carefully check the model number of your device and the part number of your original Battery to see if this Battery is compatible with your device. - A new battery will achieve its best performance after 2 or 3 complete cycles of charge discharge. - When you install it, be sure the connector has been properly connected to your device. - Do not use low quality third-party adapter charger to charge your device, that will shorten the battery's life. Caution: 1.Don't disassemble 2.Don't dispose of in fire or water 3.Don't store above 60 ??140?? Contact us If you have any questions or any issues when using our product, please send us a message, we will reply you as soon as possible.