That's not clear at all because he states that the battery works fine when he runs it in airplane mode. If anything is clear it's that he uses a setting that a

That's not clear at all because he states that the battery works fine when he runs it in airplane mode. If anything is clear it's that he uses a setting that activates the radios too often or an app that spams notifications. Without knowing anything else about his setup I'd implicate a busy push email.