I have been monitoring my battery usage over the past 3 days on what I would consider moderate to heavy usage. On the 3rd day I used 4g for roughly 6hrs and it didnt seem to make any noticable difference in my battery. Charge at bedtime and pull it off the charger at 5:30ish am and run til about 9-10pm roughly.
Below is a screenshot of my battery graph over the last 3 days.
James