Quote:
Originally Posted by KTrain
With all iOS devices, you have to cautious of how many applications you give notification access to. Having them constantly calling their servers for updates, messages, etc will drain the battery quicker.
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I don't think this is how it works. Apps register with the push notification service, which make a single call to the Apple push server on behalf of all of them.
There are not scads of apps running or getting launched in the background to check for notifications.
Notice in this diagram that at no time does the app talk directly to its servers, other than the initial token setup - all push notifications are between a single service on the device, and Apple's servers.
The number of apps registered for push notifications does not correlate with battery drain - only the volume of received notifications would have any bearing, since those typically cause the device to wake up and illuminate the screen.