AnandTech on using your new iPad as a blazing-fast 4G hotspot for your laptop or other devices:
Now for the killer. If you have an iPad on Verizon’s LTE network and use it as a personal hotspot (not currently possible on the AT&T version), it will last you roughly 25.3 hours on a single charge. Obviously that’s with the display turned off, but with a 42.5Wh battery driving Qualcomm’s MDM9600 you get tons of life out of the new iPad as a personal hotspot.
That is an absurd number, and is great news for road warriors who often need to break out the laptop in remote locations.