Paul - yep, it's always worked on iOS (iPhone and iPad) as I recall you're using it on an iPad mini aren't you? Or are you using full web-based CP on there?
Ben - not sure on the battery life, I'll ask concept (earlier in the thread), he's been using Hudls for a while now. No, you don't need internet during the day for the mobile app (hence why cheap wifi only Android tablets are ideal for it
). You download at start of day (over wifi) and upload at end of day. You don't even need an internet connection when you tap it from the home screen.