In reply to TomBaker:
> You're being a little disingenuous here. If for example I wanted to go for a 2 hour run after work, and I last charged my phone overnight how much of those 2 hours do you think it would work?
If I have a big ball of string and I cut a largish chunk off how long do you think it is now?
It depends. I've got no idea which model iPhone you have, how old the battery is, what apps you run, how often you check messages, whether you make lots of calls, how far you are from the basestation, whether it is on WiFi most of the time etc etc. My iPhone lasts a few days between charges, I don't usually run as long as 2hrs, probably if I was going to use Runkeeper on that length of run I'd charge the phone first it doesn't take long to top it up..