Mine will be for home use only
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I have several different styles of adapters, including one like this:
There are other choices, including a couple sold under Amazon's brand.
I also have one of these: https://www.amazon.com/gp/product/B00ATZJ5YS?psc=1&redirect=true&ref_=oh_aui_detailpage_o02_s00
Since I have several tablets, and my iPhone, that may need charging at one point or another, one of the adapters with more than one port works best for me. I have two 436HP's, a BCD325P2, and an HP-2, which also utilize USB power.
If you have one of the 'power banks', sold to allow charging of your phone, tablet, or iPad when there is no power (one example: https://smile.amazon.com/Anker-High...ble-External/dp/B00N2T7U90/ref=dp_ob_title_ce
), you can power a scanner, without using a wall wart or the internal batteries, for a day or more. That depends on the capacity of the portable charger, and on the level of activity the scanner is catching. the higher capacity, multi-port adapters, like the example above, lets me charge various combinations of devices, including the portable chargers, at one time.
Here in the DFW Metro area, my 436HP will run 5-6 hours, with high capacity Eneloops installed. But when I visit friends out in a rural area 110 miles or so to the west, the same scanner and batteries will last pretty much all day, 8-10 hours or more, since there is afr less radio activity to be heard.