I haven't seen anyone in this recent thread, or even previous threads,
indicate that Apple's implementation of bluetooth or wifi isn't
extremely efficient. That's different than saying turning these features
off won't save power, even if it doesn't seem significant.
I did a quick search on the web, and I didn't find any site that claims
to have actual metrics on how much the phone battery is drained by
having bluetooth or wifi on, if at all. I did see the following web
sites with battery saving tips though. Not all of them mention
bluetooth, and it seem clear that screen brightness, location services,
cellular connections and frequent fetching/pushing of data are the big
culprits.
As with these issues where it's hard to get a clear answer, my advice
would be to turn off bluetooth if you think it'll save power and leave
it on if you're happy with your battery life. For me, I'll leave it on
if I have a bluetooth device with me, like my headphones or my keyboard,
but if I'm out and about without any bluetooth devices on me, and I'm in
settings anyway, I'll go ahead and turn it off.
Sites recommending turning bluetooth off:
* http://ipod.about.com/od/iphone3g/tp/iphone-battery-life.htm
*
http://www.slideshare.net/mobile88com/the-apple-iphone-5-battery-saving-tips
* http://www.tuaw.com/2011/05/24/four-tips-for-better-iphone-battery-life/
Sites which don't mention bluetooth:
* http://www.apple.com/batteries/iphone.html
*
http://www.huffingtonpost.com/2012/10/09/iphone-5-battery-life_n_1948534.html
*
http://www.huffingtonpost.com/2012/10/09/iphone-5-battery-life_n_1948534.html
*
http://blogs.computerworld.com/19223/six_tips_for_better_apple_iphone_4s_battery_life
* http://www.geeksugar.com/How-save-battery-iPhone-4-20180988
On 04/09/2013 10:44 PM, David Chittenden wrote:
Contrary to the beliefs of several people, Bluetooth management in the iPhone
is extremely efficient. If nothing is connected, Bluetooth remains off. It is
able to switch on rapidly when a Bluetooth signal is obtained, but the
Bluetooth transceiver's system will only cause a couple percent per hour of
increased battery drain when active with one device.
Even wifi switched on but not connected is extremely well managed, so its drain
is negligible. When connected to Wifi, on the other hand, and actively surfing,
getting email, and other data transfer tasks, Wifi becomes quite draining.
That said, the largest drain I've seen on my iPhone is from GPS. This makes
sense when one considers how weak GPS signals actually are.
David Chittenden, MSc, MRCAA
Email: [email protected]
Mobile: +64 21 2288 288
Sent from my iPhone
On 10/04/2013, at 12:37, "Lisa belville" <[email protected]> wrote:
Nope. I guess for me and probably for lots of people, it's the idea we've had
engrained in us from using windows that less programs open makes it easier to
switch between applications on the fly. I'm thinking of people who rely on the
Alt+Tab keystroke to move between open programs.
But, I was out today launching and then closing apps using the app switcher and
if anything, all of that moving apps in and out of operation seemed to drain
the battery faster. I had 38 percent battery power when I started my
unintentional experiment and wound up with 22 percent battery power after about
2 hours of downloading and installing 2 apps as well as doing some live
streaming while simultaneously switching between a combination of iMove,
Talking Goggles, and the iPhone camera.
Part of this was to demonstrate some features of the iPhone to sighted family
members and also to get more familiar with how streaming and app usage behaved
while using the phone completely on the Verizon network.
I turned the screen curtain on and off numerous times and used the triple click
home feature to turn VO on and off to make things easier for the sighted people
using the phone.
Today was unusual in that I normally don't have several apps open at once or
download app after app and then mess around with their settings. I also don't
have sighted folks using my phone so there's no need to adjust the screen
curtain and VO settings.
I noticed that the Wifi setting automatically gets deactivated while the blue
tooth feature does not, this even if my keyboard was here at home while I was
across town. Admittedly, this may have been the cause of the battery draining
so quickly.
I do keep the screen curtain on out of habit just as a privacy precaution. I've
lived around sighted people all of my life, so I've learned to be a bit
proactive when it comes to keeping my net surfing/phone usage as private as
possible.
Lisa
I've Got A Mind Like A Steel Trap - Rusty and Illegal In 37 States.
Lisa Belville
[email protected]
----- Original Message ----- From: "Alan Paganelli"
<[email protected]>
To: <[email protected]>
Sent: Tuesday, April 09, 2013 11:19 AM
Subject: Re: a battery saver, but effective?
a battery saver, but effective?None of them actually can save you battery
power. They just monitor power consumption and the apps that your not using at
the time so you can close them and I'm not all that sure that works either.
I've tried deleting apps from the app switcher as somebody said you have all
those apps opened and I never saw that that made any difference either so these
kinds of apps probably won't gain you any extra battery power. Just because
there's an app for that doesn't always mean it's worth anything in my opinion.
----- Original Message ----- From: Ramy Moustafa
To: [email protected]
Sent: Tuesday, April 09, 2013 6:41 AM
Subject: a battery saver, but effective?
Hi all:
Please I need to ask if anyone find a good battery life saver for I phone? I
found some programs but they didn't do anything.
Any ideas?
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