Are you sure your Whispernet switch has not accidentally been turned on?
Also, despite what the battery indicator shows, can you go the usual time (7-8 days) without getting the message that it needs recharging? If so, forget the indicator.
One thing to try: take the battery out and put it back in. Then do a hard reset, and no matter what the indicator shows, plug it in and give it at least two hours charging. See if that fixes it.
How long did the original battery last? I bought an extra just in case, but even with heavy reading daily, and my K1 being more than one year old, the first battery is still plugging along perfectly. I did plug in the new bettery and charged it, just to be sure it worked, and then set it aside.