The new iPad has a very powerful battery compared to the iPad 2. As far as iPad 2′s battery is concerned, the batter is very good, I have been using iPad 2 for almost a year now and never had any problems with the battery back up and my usage.
Now let us look at the new iPad, which has a much powerful battery, but we should know that the new iPad would need more battery power as it has some new features which need more power like the Retina Display, 4G, Siri, etc. We need to hear from people who will be using this new product and know more about the battery power.
As per the specs of the New iPad battery and power : Built-in 25 watt hour rechargeable lithium polymer battery and it gives up to 10 hours of surfing the web on Wi-fi, watching video or listening to music. I guess this would be working well with the new features of the new iPad