I was having problem of battery drain on my 1520 and was waiting for next build so that it gets sorted automatically. However, that has not much helped after I installed 10586.71. The situation of the battery still remains the same. It still drains faster. Further Display consumes >70% of the battery. I didn't want to hard reset and hence waiting for some creative solution from Microsoft.
I checked the firmware on my 1520 and found that the Firmware still continues to be the Denim one in 1520 whereas the 950s have received new Firmware. Microsoft has just announced that it will provide new Production Firmware once ready. So i hope the new Firmware are released by Microsoft which might address several problems in W10 OS.
Can anyone confirm if my thinking as above makes some sense or not?