Typically for me, YMMV, iPads don't burn up as much battery as iPhones due to no, or at least less, cellular use. In my case none. Plus the batteries on the iPads are huge compared to the iPhones. I too have never had any issues with using an iPad all day. But then all my iPads have been the WiFi only kind with no cellular radio. Even my old mini 2 which I recently sold could hold a battery charge all day as long as I wasn't watching videos are streaming stuff all day. Reading is a light drain on battery charge as long as the display brightness isn't too high.
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