I'm worried my Lumia 1020's battery's dying. It seems to be draining really fast, to the point where even with minimal use I wouldn't expect it to last to the early evening having started the day on full charge. I've had it since launch so it's a few years old now - anyone else's battery going? Anything I can do about it? I've been holding on for a Surface Phone but it seems like it could still be a year away.