← Field Guide

Power & Electronics

Primary Charging Sources

Anker Prime Power Bank (27,650 mAh, 250W)

  • Rated energy: 99.54 Wh
  • Airline compliant (under 100 Wh)
  • Real usable capacity: ~24,000-25,000 mAh

This is the single energy reservoir for the entire system.

Anker 140W USB-C Wall Charger

Used in towns only. Allows rapid recharge. Minimizes town time.

Devices Being Charged

iPhone 17 Pro Max

  • Daily recharge requirement: ~3,000-3,500 mAh
  • Must be charged every night

Garmin inReach Mini 2

  • Recharge cycle: once every 5-7 days

Apple Watch Ultra

  • Recharge frequency: every 2 days

Headlamp, Air Pump, Ray-Ban Case

  • Recharge: once per 4-5 days each

5-Day Power Budget

Estimated Total Demand: ~24,000 mAh
Available Capacity: ~24,000-25,000 mAh

  • 4 days: Comfortable, low stress
  • 5 days: Achievable with normal use
  • 5+ days: Achievable with moderate discipline

Daily Charging Routine

Every Night (Non-Negotiable)

Charge iPhone to ~90-95%

Every Other Night

Charge Apple Watch Ultra to ~80-90%

As Needed

  • Garmin: charge if below 35%
  • Headlamp: charge if below 40%

Device Priority (Fail-Safe Order)

NEVER SACRIFICE

  1. iPhone — Navigation, communication, documentation
  2. Garmin inReach Mini 2 — Emergency communication

LIMIT IF NECESSARY

  1. Apple Watch Ultra
  2. Headlamp

FIRST TO DROP

  1. Ray-Ban Glasses
  2. Air Pump (manual inflation possible)

Power-Save Mode

Trigger Power-Save Mode If:

  • Extended cold rain
  • No service for 24+ hours
  • Battery bank drops below 35%

Actions:

  • iPhone: Low Power Mode ON, brightness <40%, uploads delayed
  • Apple Watch: Disable activity tracking
  • Garmin Mini: Tracking interval → 30 minutes
  • Ray-Ban Glasses: No video unless exceptional

Result: Gains approximately +1 extra trail day