Although I worked out the routine route today,
ipod shows distance shorter than usual.
Latest history on ipod indicates the sensor states low battery.
Nike+ FAQ site explains the battery keeps alive approx. 1000hr,
only 10 months has passed since I got nike+ kit.
I guess I've already used 300km x 5min equals 25hr.
It's far from 1000hr.
11.78km 58'58"