Battery issue seems to be getting worse. It shut down on me at 21%, I plugged it into my charger, it turned on and read 44%. WTF?
I've noticed this a lot lately, too. Strangely enough, I notice it more often in the freezing cold weather. The other day, I went out to shovel the snow while listening to music. When I went out, the charge was at 45%. After about ten minutes, the phone shut down. I went inside, plugged it in and before I even got back outside to start shoveling again, the charge was at 39%. I see you're in Philly, so I know we have the same temperatures to deal with.