Designing prototype hardware - power supply and consumption thoughts

I am in the beginning of the process designing the hardware that will surround the onethinx module. The first prototype will probably just contain a “hacked” development board. I have a few questions in the “best practice” category:

  • de-soldering R6 and connecting a 3.6V lithium non-rechargable cell directly to TP-M2, you see any problems here? (3.6v is a bit close to the 3.7v that will fry the deivce)
  • any other parts on the development board that will consume power (if I remember to power them down of course)?
  • have you made any calculations or measurements for real-world power consumption. Like how long will a device run on a 1A/h cell if transmitting say every 5th minute?