So if your phone used 50% of the total battery capacity (the top bar display says 50%) that means that "no cell coverage" used 60% of 50%, which is (0.6 x 0.5) 30% of the total battery usage for the period.ĪDDENDUM: If you tap on the display at Settings/Battery it will display the actual time that each app consuming energy spent running in foreground and background. That is, that 60% means 60% of the total battery usage over the past 24 hours, not 60% of the battery's capacity. You will only see it if it uses more than 1% of your total battery usage.Īlso, note that the battery display is a percentage of a percentage. With iOS 9.2 (and possibly 9.1) the Battery monitor now tells you about it.
In the past all of this happened behind the scenes, so you didn't know about it other than the fact that your battery doesn't last as long in a weak signal area. I've done all the troubleshooting tricks: restarting the phone, eliminating Background App Refresh, updating to the latest IOS (9.3.3), turning off Location Services, turning off automatic updates, turning off the iCloud keychain, putting the phone in Low Power. However, if it reconnects and then loses the connection frequently, the pages are sent frequently without the longer waits, again draining the battery.Īll cell phones work this way, including the iPhone. Abruptly 3 days ago, my battery began draining excessively with minimal actual use. If there's no response it repeats the request periodically, with longer and longer waits between pages. To further complicate things, if you periodically lose signal completely the phone sends a "where are you?" page to the network to reconnect. A weak signal uses 10 times as much energy as the strongest signal, so it can drain a battery very fast if you are on a call, and it will still drain the battery when not on a call because the phone periodically reports its location to the network so an incoming call can find your phone.
When cell coverage is weak the phone increases its output power in an attempt to maintain a connection.
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