Birdlog ANZ and iPhone battery issues

To: eBird ACT <>, Birding-aus <>
Subject: Birdlog ANZ and iPhone battery issues
From: David Burren <>
Date: Fri, 19 Dec 2014 12:54:02 +1100
On 19 Dec 2014, at 10:46 am, eBird ACT <> wrote:
> I would like to know if other users of the superb Birdlog ANZ app are having 
> issues with the app draining their iPhone battery. I have used the app  on an 
> iPhone 4S, 5S and now on a 6+, all with the same issue of rapid battery 
> drain. Despite the much larger battery on the 6+, in 4 hours yesterday I was 
> down to almost 20% battery. One of the reasons  I bought the 6+ was because 
> of the larger battery. 
> I have put the phone in  airplane mode, and turned off location services, but 
> to me the former defeats the purpose of having a phone. 

I can't comment on the app itself, but using a phone away from mobile cell 
coverage is always going to suck power.

On an iPhone if you turn on Airplane mode that turns off the WiFi, Bluetooth, 
and the mobile/cellular radio (which includes the GPS). So in that case there's 
no need to also turn off Location Services.

If you want Location Services to be active, Airplane mode must be off (the 
phone will be looking for cell towers). However you can obviously turn off WiFi 
and Bluetooth if they're not going to be used (or you can turn them on after 
activating Airplane mode).

But the biggest things which will suck your phone battery are the screen 
brightness plus 4G. The easiest explanation is that if you're away from a 4G 
coverage area the radio will waste a lot of energy looking for 4G towers. In 
the Cellular section in the iOS Settings app you can easily disable 4G (but you 
can't disable 3G/etc unless you disable Cellular Data altogether). If you 
disable Cellular Data you'll still receive phone calls and SMSes (but not 
iMessages which tend to get automagically used because they're cheaper).

I hope this helps at least a little.
David Burren

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