loïcfernandezcastrillon wrote:
Then answer to my questions 🙂
1. Why do you need to have the WiFi, Bluetooth, PING, and Siri raise to speak always active when you know you won't use it? Do you let your TV on all the day even if you aren't home? When I know I'll get home I turn on WiFi and I let it active if I know I'll connect later on another one. But if I know I won't use it all the day, I keep it turned off.
If I don't use a feature I turn it off. But the only one that you mention that I don't use is Ping.
- WiFi is already off whenever the phone is asleep, so turning it off is redundant and inconvenient. When the phone is not asleep I WANT it to use WiFi, because WiFi when connected consumes 30 MW, and 3G consumes 20 times more power, up 600 MW. Which would you rather use? Of course, if you are never in range of a WiFi hotspot I suppose you could turn it off, but it won't save anything for the reason already given, and because even when the phone is active if there is no network connected WiFi uses minimal power because it is in listening mode only, not transmitting. Turning it off may save you 10 minutes on a charge cycle in exchange for the inconvenience of having to turn it on and off.
- Bluetooth uses no power when a BT device is not connected, as it is only listening. When connected it uses 3 MW, 200 times less than cellular connections. It thus has no measurable impact on battery life.
- I use Siri raise to speak. It also uses no power unless you raise it to speak. If you don't use Siri why do you have a 4S instead of a cheaper model?
2. Maybe you travel so much between different local times that you need Time Localisation active, it's not my case. And who cares about having adds related to our locations? I never stare at them so I don't care if it's for my location or any other one.
iAd uses no power, but I turn it off anyway because I find personalized ads creepy. AT&T provides time sync and time zone sync so I do have time localization off in the US. I turn it on if the local carrier where I am traveling does not provide time sync.
3. Maybe you don't use the iPhone that much and don't have many apps on it. In my case I have more than 100 apps I use quite often. And how bothering it is to have 5 or more newspaper app telling me the exact same thing. So I turn off push notifications for some of them, that way I've the information I need just one time 😀
I use the phone constantly, and I have 180 apps on it, and use about a dozen of those multiple times a day. I use several where I am glad to have Push notifications, such as traffic reports, transit alerts, weather alerts. I only have 2 news apps. I never kill apps in the quick launch bar.
My battery lasts through a working day, and 2 days on weekends. I charge overnight every night, so my phone is at 100% when i start the day. Then I don't think about it and it seems to always be available.
The bottom line is that heavy battery use comes from only 2 sources, 3G data use and interactive games. WiFi, BlueTooth, Location Services, etc make very little difference in time between charges. One app that uses data will wipe out any gains from turning these off in 5 minutes of use. If you have a battery life problem focus on the heavy users of power, not the insects.
