Try this.
There is a fix:
1) Go to dialer, put in *#*#4636#*#*
2) Press Phone Information
3) Press Menu, and pick Select Radio Band (ITS NORMAL TO GET A FORCE CLOSE)
4) Go down and change GSM Auto(PRL) to CDMA Auto (PRL)
The reason this is sucking battery is because the phone is connected using CDMA PRL but its set to GSM so its looking for a signal via SIM, which we don't have.
xda-developers - View Single Post - 2.1 users what is your Time without a signal %"