iPhone 6 take longer time to charge after upgrading to ios 8.2

Did someone have the same problem with me? After updating to ios 8.2, time taken to fully charge the battery seem longer than usual. Usually, it take roughly about an hour to charge from 10% to 100% but now it take nearly 3 hour. I have try to pull out the charging cable when the battery reach 96% and then plug in back after a few second. The battery percentage shows 100% after i plug in the charger. Is there something wrong with the system or the battery?