Google Nest Community

You have a couple of options, 1) buy a known fast charger something like this: https://tinyurl.com/fastCharg, you will probably need a USB-C to USB-Micro cable https://tinyurl.com/usbctomicro, and if you really want to know if its charging get a USB ...

did you happen to do a power test from the thermostat? 

To be clear, when you unplug the USB cable from the thermostat you get the battery error? I am wondering if your USB adapter is not strong enough to charge the base? If you look at the USB adapter, what is its output rating? The output amps is the im...

You should only need 2 wires. Did you forget to turn on the furnace after wiring? for the Nest no jumper is required between RH and RC.

what model thermostat?