I wrote Battery Widget. Thanks for catching the zoom level / stats page bug. I'll have that fixed in the next release.
The charting issue is definitely weird. Are you still consistently seeing that? I would have to imagine that's some sort of an issue with the charting toolkit I'm using (Telerik). They did recently release an update, I'll have to check the change logs to see if there was anything related to this in there.
To follow up on this - I've been able to repro this by having very old entries. A lot of Lumia 920s (mine included) have a bad habit of crashing and restarting with an old date set. This screws up the charting control. For now, you can fix it by enabling the "clear entries older than 30 days" option in the settings and restarting the app. For an upcoming release (1.4) I'll have a real solution in place, but this will do the job for now.
I am on V1.2, that's the newest I could find in the Store.
I tried the "Clear All Entries" button, but when I exit and re-enter the App, there is a never-ending "Loading ..." animation.
That's all I get ...
The never ending loading animation happens when it finds a conflict when trying to save an entry (fix is coming for that, too). If you quit and restart the app (a minute or so later) it should go away.
Sorry for the trouble. I'm pushing out updates as fast as Microsoft lets me - 1.3 was submitted as soon as 1.2 was approved, and I've got 1.4 just about ready to go as soon as 1.3 goes through :grin: