Battery on all apps is showing 97% when fully charged. BUT when I plug it into the computer it shows 100% in the charging screen. Take it off the charger and it then shows 97%.
What the links above show is this is totally normal and has been the case since the 23x first came out.
I never head the exact cause, but I wouldn't worry about it at all. It's got nothing to do with the apps though. It's something with how the firmware is reporting the battery level to all Connect IQ apps.