Anybody found this?
Let's make sure OP is clear on the issue though. There are two settings regarding time zone. One is called automatic time zone, the second is in location services/system services and it's called setting time zone. It's this latter one that causes battery issues. I found that mine was always on, meaning the GPS chip was frequently running. Killed my battery as a result. Battery went back to normal after I turned off that setting.
Some seriously hostile responses here.
It's just a discussion on a forum, guys. No need to go around punishing people for asking innocent questions.
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It's the latter I'm talking about. It periodically probes the GPS. In my case there's no need for this because I live in a country with only one time zone and will not be travelling much with my iPad.