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Battery discharges much slower in other countries

I have a Lumia 820 for 2.5 years now. The battery usually lasts for only one day even without using it. I recognized that the battery lasts significantly longer (three up to five days) when I'm in a ...
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Are extra batteries bad for the phone?

I have a Lumia 820, and use a lot of data on it as well as plenty gaming. Of course, fast battery drainage is a result. The battery always gets eaten up by mid-day every day. I was thinking about ...