Big Buddy heater USB power bank supply modification

I have a Big Buddy heater that had the internal fan already installed.  These units can power the fan with a special 6V plug or 4 x 1.5V D batteries.  This is just a simple way to convert your heater fan power source to be used with any power bank.
The power banks only put out 5V but I don't find a big difference between the 6V factory power to the 5V drop
If you have any questions please ask.

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