It just seems to coincidental that my original battery was starting to fail when I did the windows advisor to get windows phone 10 on my phone. After reading this forum I had the same symptoms with battery discharge from 100 to 80% then dead. I ordered an official battery replacement for my 1520 the new battery is dated 12/2014 a year younger than my old battery. I got the new battery to come with the tools too. It was not that hard to replace although I tore the foil tape that partially covers the battery but I managed to peice back together. The phone does power up and work as I am typing this now through it. I think we not suppose to use those fast chargers on the Nokia batteries it wears then out quicker maybe? I will just use the Nokia charger be it slower charge but maybe it will make the battery happier. If I run into any issues I will post them here.
PS. One thing I did notice the old battery was a bit swollen. The new one is flat.
PS. One thing I did notice the old battery was a bit swollen. The new one is flat.
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