Clunegapyears
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Most USB hubs require a 12v supply anyway and as mentioned earlier, they are usually only for data not power/charging.
Choose a dedicated USB charging hub that plugs into a 12v cigar socket, which is connected to the leisure battery.
It's not good practice to run accessories from the engine battery, to minimise the chance of a flat engine battery.
Did so - don’t have a tv so running off that cigar 12v over the foot of the bed. Also bought a second for the front cigar lighter, but it goes off with the engine. All working well
