I was less than a mile from the destination at a cycling friends house to pick up tires, on a road easily climbed by a normal bicycle, so I walked there and back to give the bike a rest (let the batteries re-balance a bit), before limping - like barely limping - to his driveway for an extension cord. The voltage drop on the left is due to my own hot-rodding up the hills, the computer was turned off for serious limping efforts.
An hour later I was off again, the voltage drop considerably less than before (right side of graph).
The lesson is that battery decay even happens to me, and that I should stress things to the max more often in a safer way. My power left meter indicated I had 78% of my pack left of my 3300 KW-hr - I need to check the calculations but that seems way off. The whole voltage drop effect might be due to the batteries at the edge of my chain going out first - my usual commute I ride 2-4 miles, park all day and go home on flattish terrain.
The fix? #1 Calibrate the gauge, #2 check the batteries individually, #3 time for a new battery solution.
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