A couple of notifications:
When comparing the original and the new iPads, the original had both smaller-capacity battery and lower-resolution screen. These two combined, the charging time is obviously longer (because of the bigger battery) and the draining is faster (because of the much higher screen resolution). The screen in this size is easily the number one battery eater. The rest of the features come long behind it what comes to battery usage. Especially if you use applications that need to update the screen rapidly, like games or videos. Even web-surfing eats the battery way more than in the original iPad.
And what comes to charger, I was advised not to use the iPhone charger. If you plug the phone charger into the pad and continue to use it while it's plugged, the battery might even drain instead of charge. The differences between phone chargers and pad chargers are so big, what comes the power.
My iPad (the new one) takes about 5-6 hours to get charged from 10% to full. And with a moderate surfing and occasional gaming, it needs charging usually every second day (night).
