Helpful links detailing different iPad models (FlitePartners is not responsible for accuracy of these sites):

Apple Support Website https://support.apple.com/en-gb/HT201471

Lifewire website https://www.lifewire.com/list-of-ipad-models-and-generations-1994232

Fix My Apple http://www.fixmyapple.com.au/identify-your-ipad

To identify your iPad you can find the model number here:

iPad 4 Battery Discharge and Charging Rates (Full and Half Screen Brightness)

Running Jeppesen, GPS, WiFi, Bluetooth - worst case scenario

Useful iPad info

Links to useful iPad sources:

MacFixer - iPad repairs

Links to useful iPad tips:

Battery Life - Battery charging requirements

Power Usage reduction - recommended power settings