Hi
I have purchased an Anker PowerCore 15600 yesterday and connected to my Sony Xperia Z Ultra 1500mA wall charger. It’s been connected for more than 27 hours now and yet not fully charged. It took only 5 hours for the PowerCore to reach from 2nd to 4th LED but The 4th one started blinking 22 hours ago and still blinking, showing it’s not fully recharged. I have installed the Android app called “Ampere” on my phone to determine approximate power output from my charger to my phone. It’s showing the approximate output of 900mA - 1A so there seem to be nothing wrong with the charger. I have calculated the time required for my PowerCore to be charged from zero to 100 percent and it was supposed to be around 20 Hours regarding 20% Efficiency Loss. Keep in mind, my PowerCore was around 50% pre-charged when it was unboxed. Do you think it is normal or there is something wrong with my PowerCore?
Thank you