My 12.9" iPad Pro battery goes from 100% to 0% in 3 - 3.5 hours, is that normal? If the battery level is 10% and I put iPad in charge and keep working on it the battery level slowly decreases to 5% and then I get the warning message "low battery". I have to stop working and wait for hour or so to get 30-40% battery level. And on external power it will slowly drain again when I start using the iPad. My last iPad was iPad2 and I got easy 10 hours out of every single charge, and if the charge was low and I put it on external power the battery volume slowly got up. I contacted local Apple retailer and they said it was normal thing for iPad pro to have 3 hours of battery life and not keep up with external power connected. I find it hard to believe and want to hear from other iPad 12.9" Pro owners.