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The only concern is that the hotspot app will drink your smartphone's battery.

Yeah, that is the only issue I ever have when I do it, you can practically see the Nexus S battery start dying.

 

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My sister bought this thing that she can carry around with her. It is pretty large, about the size of a car battery. Anyway she can charge it up and then use it as a plug. At any given time she can just plug her phone and laptop in to it and get surfing the net. I can't remember what that thing is called though.

Something like this monster? Extreme Battery Kit DC AC Inverter Power iPad Laptop Portable Converter Battery Charger