2 wire thermostats and power adapter

[Brinbfr]

Sorry if this has been asked, my search skills are lacking. 

I have an old mercury based Honeywell thermostat with 2 wires, red and white. 

connected the red wire to R and the white wire to W and the thermostat is working for heating fine. 

the thermostat came to me with a low battery so I cannot connect to WiFi. 

bought a transformer that was supposed to work and I am supposed to connect it between Rc and C. 

problem is I do not have an Rc. 

my brand new nest only has Y, C, W, G, R, and *OB

Where do I connect this transformer to charge my batteries 

thanks in advance

[Patrick_Caezza · Accepted solution]

@Brinbfr 

You must purchase the Nest Power Connector to use the Google Nest Thermostat with your system.

Then wire it like this.

[Brinbfr]

Thanks Patrick 

I did buy the nest power adapter, but could not find the use case that you sent me above, which matched exactly what I was looking for. 
I installed per this diagram and instructions and the Nest is functioning properly and no more equipment errors. 

THANK YOU 

@Patrick_Caezza