I've noticed using cellular on the I pad runs the battery down very quickly any ideas on how to extend the battery life ?
Check what apps you've got running in the background (double click on the home button and swipe up the stuff you don't want open). Stuff running in the background is harmless, but if you are after maximum battery life conservation, you'll want to quit any apps that regularly poll any radio interfaces (GPS/Wifi/Cellular).
The wifi+cellular iPads have a location services feature, you should almost certainly turn that off since that will turn off GPS etc. which is another radio interface, and quite a hungry one at that.