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Your last paragraph is a little garbled, but if I understood you correctly, you spend most of a day reading with the light full on and used 50% of the battery? If so, yes, that is normal. High light levels will drain the battery quickly, as will leaving WiFi turned on. To maximise battery life, set the light level as low as is comfortable to read with (I rarely have mine above about level 8) and put the device into aeroplane mode.
A slight fall-off in illumination on the side away from the buttons is entirely normal.
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