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If the draw is steady a resistor is a possibility,
when I converted a old truck to 12 from 6 volt I was able to buy resistors to put in line with the 6 volt accessory still in the truck (like fan and wipers), I mounted them to sheep of aluminum and run in series, and it have been operating like that for 30 years, on most automotive heater controls it is a resistor that controls the fan speed,
as transformers only work on alternating currents,
I would guess one most likely could make a electronic control that would work as well, using a transistor of some type but I would not know how to design it properly, that would actually control the actual voltage delivered,
I think some of the new variable speed drill triggers are electronic now, and not a slide variable resister,
so I would guess if one took a trigger, and could set at the correct setting it may control the voltage,
(I really do not know, when it comes to electronic design I most like just know enough to be dangerous)
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Thanks BHD. It's pretty simple as to what I want to accomplish. I have a kobalt heated jacket that uses a 7.4v Li - Ion battery. I have a bunch of the 12v Ridgid batteries and only the one rechargeable pack from kobalt. I was going to use the LED flashlight base and modify it to output to the jacket.