Nest thermostat

[Jamespg]

Nest 3rd generation learning thermostat. I had it shut off completely for the summer as we don't have ac and when I tried to power it back on the battery was low. I charged the battery via USB and got it going again but the battery keeps dying. Help please 

[Jamespg]

I took it apart and removed the internal battery, not too difficult. Ordered a replacement from Amazon, will be here tomorrow. Wish me luck