If I add an alternate path for dealing with the dead battery situation, my solution would look like this:
PRE-CONDITION: The phone is powered off.
STANDARD PATH
S05 I press the power button and hold for 4 seconds.
S10 The phone displays my home menu and plays a sound.
S15 I press the “Phone” symbol on the menu
…
S70 The phone displays the caller’s contact info
POST-CONDITION: I am ready to click the green phone to place the call.
ALTERNATE PATHS
A01:
@S05,
the phone does not turn on
A01.05
I locate an electrical outlet
A01.10
I Plug the phone into the outlet
A01.15
The phone displays the “Charging” symbol
A01.20
RESUME @S05