Apple customer goes to the top for iPhone battery answer

bbc.co.uk

2 pointscjr4 comments

How can this answer be correct?

Some applications use the GPS, for example, even in background mode. If I kill the only such running app, there is no need for the GPS and there should be a substantial reduction in power usage, no?

> there should be a substantial reduction in power usage, no?

There is no way to know by just watching the phone's behavior. The task could be using 0.1% or 10%. If the GPS is processed mostly by hardware and the app just periodically reads the hardware the usage could be miniscule.

I don't understand your point. If I kill the only app using the gps, then I have turned off the gps hardware, haven't I? How much battery life have I saved if the gps hardware is off for an hour vs running?

Yes, you are right. My thinking was flawed.

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