Hi, after the update my Lumia 640 goes from 100% to 40% in < 2 hours. The battery used to last a full 24 hours before this update. Looking at the Battery Usage by App shows Settings at 35% (I looked at the settings for < 2 minutes!). Need a fix for this issue soon. Thanks.
5/19 Update: Installed .1003 yesterday and it didn't help at all. It looks like the cellular radio is constantly looking for a signal and is causing the phone to heat up. With all the heat build-up and the rapid discharge, I am afraid that the battery's lifetime is going to be severely affected.
5/25 Update: Downloading .1004 right now. Thanks for the update. Hopefully this fixes the battery issue once and for all!
Glad to report that .1004 has fixed the battery drain issue!