If your Nest Thermostat E displays a low-battery warning and refuses to power on or connect to Wi-Fi, you can manually charge its internal lithium-ion battery by detaching the display screen from its wall base and plugging a standard micro-USB cable into the port located on the back of the display. Connect the other end of the cable to a standard USB wall charger or computer port for 1 to 2 hours until the battery fully charges before re-seating it on the wall base. Verification: Check the screen display after mounting to confirm that the low-battery warning has cleared and battery voltage metrics have normalized.
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