Nah, I've had it a few years, so it's out of warranty. I'll probably have to replace the battery eventually. I don't mind if the battery's capacity is decreasin

Nah, I've had it a few years, so it's out of warranty. I'll probably have to replace the battery eventually. I don't mind if the battery's capacity is decreasing, I just want it to auto-sleep before the battery dies. Maybe there's a way to set the auto-sleep threshold to 25% or something?