What type of portable charger can I buy to power a device larger than a phone?

I recently bought an 'Artic Air cooler', a sort of air conditioning device, it came with a cable no box/usb adapter, so i use one of my adapters to plug it to an outlet but i want to take it with me, but im not sure which portable charger i can use for it, i want to be able to use it for 5+ hours with a... show more I recently bought an 'Artic Air cooler', a sort of air conditioning device, it came with a cable no box/usb adapter, so i use one of my adapters to plug it to an outlet but i want to take it with me, but im not sure which portable charger i can use for it, i want to be able to use it for 5+ hours with a portable charger, which one is recommended to power a device like mine, for that long?
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