Of all the many IOS updates I have done since ios 6, the ios 9.3 update seems to really "drain" my battery fast. Light usage on my 5s for (about 1 hour usage and 12 hours standby) left me with close to 50%. Then at about 10% battery, my phone shut off completely. Never seen that with any updates before.
Of course, we all know it wasn't an abnormal battery drain but the fact that I had to recalibrate the battery meter. So after 2 cycles of full change and complete drain till shut off, the battery meter is back to normal.
Of course, we all know it wasn't an abnormal battery drain but the fact that I had to recalibrate the battery meter. So after 2 cycles of full change and complete drain till shut off, the battery meter is back to normal.