Hi AndDeepBreath, MNerAnon, and cozietoesie
Energy use is a bit of a complicated area, and depends on a lot of different factors.
The Talk app is dependent on 3G or Wi-Fi. Apart from the GPS and the screen, these are the most battery hungry functions of your phone. So, unfortunately, it’s always going to belong to a category of apps that are harder on the battery when used heavily.
For that reason, I'd expect to see it towards the top of the battery use list, along with apps like Facebook, Twitter, WhatsApp etc. We did test the Talk app against those similar apps before releasing, and found it to be slightly more energy efficient than them.
But, of course, with so many phones and iOS versions out there it's hard to cover all in testing (and there's the added difficulty that different phones have different battery capacities with varying levels of life left in them).
Rather than jump into an even bigger post about it, it might be more helpful if I take a look at your specific circumstances.
Would any of you be willing to share some screenshots of your battery usage screen?
If you're happy to do that, please could you email [email protected] with your iPhone model and iOS version and we'll let you know where to go and what to screenshot (I'll need a few).
Thanks