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HP includes a whopping 1940 mAh battery with the iPAQ 910. I think this is the largest standard battery I have seen in a mobile phone and will have to test to see how long it lasts with a 3G connection.
As you can see the battery takes up a large area of the back of the device. The SIM card fits down towards the bottom under the battery.
The back cover has a soft touch feel and as you can see in this photo the stylus is actually mounted to the battery cover and not inside the device casing.