- With no load, I measure 3.17V
- With 100kOhm100kΩ load, 2.91V
- With 10kOhm10kΩ load, 1.59V
- With 1kOhm1kΩ load, 0.29V
The math works out to a 10kOhm10kΩ series resistance between +V and ground.
As such the maximum power that can be drawn is at 1.59V/10kOhm10kΩ load, or 0.25mW max power. Short circuit current would be about 0.3mA.