My power walks for the past few days have been cut short by pains in my right leg; maybe I was simply out of condition after not walking for a few days. The pains came before the problems with the phone battery so I can't even use that for an excuse.
But maybe those days were training me, getting me back into condition. Today I walked 5.17 km with nary a hint of pain. Using my new technique with the mobile phone, the battery capacity was reduced from 100% to 92% - negligible.
I'm fairly happy.
[SO: 3889; 3, 16, 37]