Hi, folks. Didn't see much about this anywhere. My F3 is not quite two years old. Battery was fairly low last night, put it on to charge as usual, grabbed it on the way out the door this morning. Looked at it on the train and it was half discharged, so I was thinking maybe I didn't actually plug it in or something last night. So I plugged it in on a USB port at work, so slow charging of course, but this is glacial, nothing like this before. It only gets to about 45%, then when you unplug it it starts to drop, within a few minutes at 38%. I turned it off and cleaned the battery contacts, then left it off but charging for more than an hour with the same result. Is this a known issue? Is it likely I have a failing battery, or is there something else afoot? Thanks for any useful input.