I have several devices that charge by USB, that I'd like to keep charged at all times.
I've used my laptop in the past, put it in the lowest possible power setting, but it still gets hot, and is using more power than necessary and only lasts 2 hours.
Is there a device that can be used to charge USB gadgets, that is essentially a large battery with USB connections?
I'm not looking for a hub that requires a connection to a computer, I want a standalone charging device that has a large enough battery to charge multiple devices.
Ideally something with a car voltage adapter for charging itself would be optimal.
Would keep it in my backpack/suitcase and devices plugged in until I need them would be optimal usage.