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WiFi vs Mobile Data: Battery usage

Case 1: I use the mobile WiFi for Internet usage (assuming normal usage - majority of the time, phone being idle with intermittent Internet usage). Case 2: I keep WiFi off, and use the mobile's data ...
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Which uses more battery power, WiFi or 4G? [closed]

I hope this is a general enough question that doesn't vary too much by phone model, but suppose at school or work you have a WiFi connection, which would use less battery power over the course of a ...