Major story revision based on real-world testing and analysis:
**New Findings:**
- Root cause: Voltage drop below 3.45V (4G module minimum), not power budget
- SimTech SIM7600G-H operates at 3.4-4.2V; hangs below 3.45V threshold
- FEB-4000 battery test: 13.4 Wh usable (54%) above 3.45V threshold
**New Features:**
- Add 3.45V reference line to Energy Output vs. Voltage chart
- Visual indicator for 4G module minimum voltage threshold
- Real discharge curve analysis from 2h 48m FEB-4000 battery test
**Story Changes:**
- Focus shifted from power (watts) to voltage stability
- Include community discussion findings from ClockworkPi forums
- Add detailed FEB-4000 test results with screenshots
- Reframe 4G power manager as voltage-aware solution
- Add battery rating methodology based on usable capacity above 3.45V
**Screenshots Added:**
- feb4000-battery-percentage.png - Full discharge curve
- feb4000-voltage-current.png - Voltage/current trends
- feb4000-energy-output-with-threshold.png - Critical 3.45V analysis
This reflects the actual discovery: not insufficient wattage, but voltage sag under load causing 4G module brownout.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
denq
5b5c2dfa4e