OK, so if my 12v supply was at 4a, I should be OK. Of course this is all theory.
I do like the look of this for a portable option
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Jackery Explorer 250 Portable Power Station
The Jackery Explorer 250 provides power-to-go in a compact, lightweight design featuring multiple connections to charge your gear, devices and more. Use it indoors in your home or office as a back-up power supply, or take the Explorer 250 with you on camping holidays, overland trips, hiking...jackery.co.za
Looks like it has pass-through charging as well
