I had sold my 32 gb iPad just before the new IOS became available so I am basing this on 2 sort of different animals. I believe the battery life is much better now. I can play around with my iPad 1 just about all day with out having to recharge the battery.
I operate my iPad with full brightness without using the shut down after a certain time feature.
Sent from my IPAD 1st generation. WIFI only. 64GB