About this item ??Compatible Model?Replacement Battery for Nest 3rd Generation, TL284443, T3007ES, T3008US, T4000ES, A0013. ?Before purchasing this battery, please make sure that the your Thermostat model number matches! ??2024 New Upgraded Capacity?680mAh high capacity, more power than original standard battery, same size but more capacity and more power life. You will no longer have to worry about your thermostat running out of battery quickly! ??Installation Tips?Battery for Nest Learning Thermostat 2nd 3rd Generation comes with repair tools. If you want to replace the battery more easily, we highly recommend you to watch videos about TL284443 battery replacement on YouTube. Novices can easily install, no need to worry about the installation is too complicated. ??More Protections?DRECHAS TL284443 Replacement Battery is made of A-grade high quality batteries. Built-in smart chip to prevent over charging, over discharging and overheating protection, short circuit protection, high safety performance, long service life. Meanwhile, DRECHAS brand batteries are tested under strict quality control standards and certified by CE, FCC, UL, PSE, ROHS. Ensures efficient and safe use.