Yes, having Bluetooth turned on when no bluetooth device is connected is a drain of approximately 1% of battery life per hour. The battery drain is negligible.
David Chittenden, MSc, MRCAA Email: [email protected] Mobile: +64 21 2288 288 Sent from my iPhone > On 10 Feb 2014, at 13:24, "Julie Dawson" <[email protected]> wrote: > > I also know that having bluetooth turned on when not using a bluetooth device > is a battery drain so I keep mine turned off except when using a keyboard, > speaker etc. > Live simply, > Love generously, > Care deeply, > Speak kindly > And leave the rest to God! > > ----- Original Message ----- From: "David Chittenden" <[email protected]> > To: <[email protected]> > Sent: Sunday, February 09, 2014 11:32 AM > Subject: Re: battery drainage > > > Actually, the sole biggest drain on the battery is the GPS receiver. When the > GPS receiver is running, one can expect to get two to three hours of battery > life. > > The second biggest drain is the iPhone's phone transceiver. > > The third biggest drain on the battery life is most likely the combination of > the touch-screen and the back-light. Turning the back-light down to its > lowest setting will significantly help. Of course, locking the screen is the > only way to deactivate the touch-screen. > > Wifi is probably the fourth biggest battery drain, but only when wifi is > actually carrying an internet signal. I leave wifi on and, unless I have > active throughput, the battery drain is rather minimal. > > After wifi, the fancy graphical parallax features provide a decent battery > hit. This can be disabled in accessibility. > > Though many do not believe it, Bluetooth is actually a quite minimal battery > drain. If no bluetooth device is connected, the drain to the battery is about > 1% per hour. When a bluetooth device is connected, the drain ranges from 3% > to 7% per hour, depending on how strongly the iPhone needs to push the > bluetooth signal. For instance, the closer the device is to the iPhone, the > less signal strength is required. That said, the exception is when using an > earpiece, and the iPhone is against the body on the other side of the body. > The human body is made primarily of water, and water absorbs radio signals. > Therefore, the iPhone is required to bump the bluetooth antenna up to maximum > which gives a very significant signal drain, and skews battery observation / > testing with bluetooth devices. > > David Chittenden, MSc, MRCAA > Email: [email protected] > Mobile: +64 21 2288 288 > Sent from my iPhone > >> On 10 Feb 2014, at 6:29, Alan Paganelli <[email protected]> wrote: >> >> The two biggest drains on the iPhone are the Bluetooth radio and WI_FI.. >> It's easy to tell Siri, turn bluetooth off and she'll say I turned Bluetooth >> off. Do the same with WI_FI. Those are the two biggest battery drains. So >> if you have no ear peace connected to Bluetooth and your away from your home >> network, you don't need the WI_FI either. And, it can quickly be turned >> back on again when need be. >> >> HTH >> >> >> Alan >> >> Sent from my iPad Air >> >>> On Feb 8, 2014, at 3:10 PM, Adrienne Sinclair Chalmers >>> <[email protected]> wrote: >>> >>> Hi >>> >>> Of course it's true that some apps use more power than others, but if a >>> phone is draining, then the most obvious explanation is that one app or >>> another is using the power and it's just an easy thing to eliminate. >>> >>> In Mavericks, the battery menu shows you which apps are using significant >>> amounts of power. If there is a similar thing in IOS7, I haven't found it >>> yet. >>> >>> Reducing screen brightness is a really good one too. I always thought it >>> counter-intuitive that the screen curtain didn't reduce power use, but >>> them's the breaks. >>> >>> I have absolutely no authority to back this up, but I am convinced I >>> noticed a reduction in power usage on my 5s after I locked the screen >>> orientation. >>> >>> Best >>> >>> Adrienne >>> >>> -- >>> You received this message because you are subscribed to the "VIPhone" >>> Google Group. >>> >>> Post a new message to VIPhone by emailing [email protected]. >>> >>> Search and view the VIPhone archives by visiting >>> http://www.mail-archive.com/[email protected]/. >>> >>> Reach the VIPhone owner and moderators by emailing >>> [email protected]. >>> >>> Unsubscribe and leave VIPhone by emailing >>> [email protected]. >>> >>> More VIPhone group options can be found by visiting >>> http://groups.google.com/group/viphone?hl=en. >>> --- You received this message because you are subscribed to the Google >>> Groups "VIPhone" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to [email protected]. >>> For more options, visit https://groups.google.com/groups/opt_out. >> >> -- >> You received this message because you are subscribed to the "VIPhone" Google >> Group. >> >> Post a new message to VIPhone by emailing [email protected]. >> >> Search and view the VIPhone archives by visiting >> http://www.mail-archive.com/[email protected]/. >> >> Reach the VIPhone owner and moderators by emailing >> [email protected]. >> >> Unsubscribe and leave VIPhone by emailing >> [email protected]. >> >> More VIPhone group options can be found by visiting >> http://groups.google.com/group/viphone?hl=en. >> --- You received this message because you are subscribed to the Google >> Groups "VIPhone" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/groups/opt_out. > > -- > You received this message because you are subscribed to the "VIPhone" Google > Group. > > Post a new message to VIPhone by emailing [email protected]. > > Search and view the VIPhone archives by visiting > http://www.mail-archive.com/[email protected]/. > > Reach the VIPhone owner and moderators by emailing > [email protected]. > > Unsubscribe and leave VIPhone by emailing > [email protected]. > > More VIPhone group options can be found by visiting > http://groups.google.com/group/viphone?hl=en. > --- You received this message because you are subscribed to the Google Groups > "VIPhone" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > -- > You received this message because you are subscribed to the "VIPhone" Google > Group. > > Post a new message to VIPhone by emailing [email protected]. > > Search and view the VIPhone archives by visiting > http://www.mail-archive.com/[email protected]/. > > Reach the VIPhone owner and moderators by emailing > [email protected]. > > Unsubscribe and leave VIPhone by emailing > [email protected]. > > More VIPhone group options can be found by visiting > http://groups.google.com/group/viphone?hl=en. > --- You received this message because you are subscribed to the Google Groups > "VIPhone" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the "VIPhone" Google Group. 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