Get power wherever you want with a battery-powered portable generator. : Portable power stations are the smaller, lesser-known cousin of generators. These versatile, lunch-box-size gadgets can go with you on camping trips, to construction sites -- wherever else you need electricity -- to keep your phone, power tools and other electronics charged and running smoothly. I picked seven power stations to test for this list, ranging in price from $270 to $1,200. Here, I focused exclusively on rechargeable battery-powered models, although gas models are available, too.