Four, on the rando bike. Lots 'o night riding.
- GPS Unit (2xAA)
- Backup taillight (2xAAA)
- Double backup blinkie on helmet
- White light on helmet for fixing flats etc.
Primary lights are dyno. Phone is off and stowed.
I always intend you add a backup headlight on 1200s, but it's still frickin heavy I never do.