The USB cable is a good option to be able to use any pd power bank and not need to make a custom battery with buck converters and other kit electronics.? Also one less thing in a bag.?
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Mine runs a little over 12v, 12.3 was the max it hit, so I would expect yours to perform around that.
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The variable pd cable is also viable, just change the voltage without the radio connected as it might change to the higher, 15v, option and that is no good.
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73
Jason
Jason