I have searched these boards in detail and even though there are a bunch of power supply related Q&A none answer my specfic question.

First, I'm not an Electrical Engineer or a power system designer, just a hobbiest, thinker. So here it goes.

Everyone looking for an external power source ends up using a 120 or 220 volt AC battery pack. While this is fine it still has the 12V DC supply running through a step up transformer and a power inverter to get to the AC voltage required to power the includeded power supply. Because of this there is a parisitic drain and a power loss which is why the power pack only lasts a few hours.

Now my thoughts and questions are/is; The output of the included power supply is 12V DC, the voltage output of a deep cycle storage battery is right around 12V DC, often a bit higher but close. Why don't we just not use the included power supply and plug the USB hub right into a cigaratte lighter adapter and into the 12V storage battery? I can almost guarantee you would get 12 hours out of that setup, probably more, and you can take the storage battery back to the hotel or to a near by power source and charge it. If you camp it could be solar charged or charged by your car or truck charging system.

Has anyone tried this? I would be willing to be the first if I can get an additional USB hub so just in case I burn it out and it doesn't work I would have another.

Anyones thoughts, please...

Bob

Bob's Bees Apiary