I just got my 15AL with 10.2.7 and the entire time i had it, 100% battery was 1hr and something, at 99% it would say 1:47 min or whatever.
Just installed 10.2.8 and unplugged, battery is only at 65% and it says 2:30 !!! so, this means that It definately reads much higher, and perhaps the bug was creating the "horrible battery life" scare. I agree it may get less time in real world, but i was very disturbed by 100% reading 1:47 min. Now i am guessing it will get above 3hrs at 100%
All good now... 10.2.8 is a must install update if you have 10.2.7 (15/12/17 new versions)