Wrong display value

Since loading the new, not very good, app my battery is constantly showing the wrong value. This morning it was showing 2%, last week I had confirmation the battery was at 99% but the app value was showing at 32%.
Does anyone else have this problem, better still does anyone know how to fix it?

RTB
How do you know the app is showing the wrong value?
What is showing you the "right" value?
What kit have you got?
Can you login to the portal?