Not sure about all the models, but mine has two USB ports and some common USB cables, so it can certainly run USB devices. Also has a 12v port and a 19v one, which would be for laptops. Mine's an 18Ah battery; they come in different sizes. It's obviously optimized for starting (quick burst of lotsa amps) so I'm not sure in real world use it would outperform another 18Ah battery for deep-cycle type uses. But good in a pinch. Wouldn't be my first choice for a fridge.
And not to be too picky, but it is NOT a charger; it's a battery that can be used to power stuff, including your vehicle's starter. It COMES with a charger to charge the Anti Gravity battery itself.