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The drop during reading time looks fine to me, but the 2% drop in sleep is excessive, shouldn't have shown any drop in 2 hours of sleep, if WiFi is off. There is no hard and fast rule to calibrate the battery, i would say use it normally and recharge as you see fit, while monitoring the charge over a few days. For reference, I read 1.5 to 2 hours daily and i get 4 weeks on a charge. WIFI is always off on mine though, and never turn the device off.
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