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Old 09-09-2019, 04:28 AM
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Default 18 vdc to 12vdc

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Doing yard work I realized I'm up to 11 ryobi batterys.
putting them all away I noticed all the 12v items I have.

Did a google seach and came up with adapters that seemed to use resistors,others that had some typ of"transformer",and a few others that were adjustable for bot input and output using pots.

Crazy thing was most were under 5$.
It may never happen,but at that price it would be fun to play around and see what I can power..like a CB or cigareete lighter fan,spotlight,etc.

Could be any cordless tool battery,I just happen to have ryobi.Anyone played around with doing this and have comment or suggestion.
I'm sure its not ideal,just a backup to a backup to a backup.
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Old 09-09-2019, 05:06 AM
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I have often thought it would be nice to have a Ryobi One+ jack under the hood of the car to serve as an emergency jump starter, but maybe the battery would overheat or something?

I simply bought a nice lithium jump pack for each vehicle.

Ryobi sells a superb LED spotlight, and a decent battery powered fan at least.

For the house, I also hooked a couple car batteries together in parallel and made a 12 V power center for outages.
Small TV, Fan, AM/FM radio, LED lights cell phone chargers, etc. It sits there with a smart car charger on it all the time, in a rubber tub from home depot.

Converting 1 DC voltage to another involves a lot of steps that lose power along the way.
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Old 09-09-2019, 05:41 AM
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I used a Ryobi 18V battery pack to run 2 12V UV lights. Used them as illuminators for a NV scope. Placed the lights out near 200yards. Worked really nicely!

I used an older standard bulb Ryobi flashlight and just pulled the bulb housing/wired in leads for the UV lights.

Most things 12V likely wouldn't get harmed using an 18V.
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Old 09-09-2019, 08:07 AM
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One way you could do it if you had to, use the 18 volt batteries to charge a 12 volt car battery. Should work....probably.

Although if it was SHTF and I really wanted 12 volts I would take apart the 18 volt batteries and wire up the appropriate number of cells.
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Old 09-09-2019, 09:03 AM
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Very few DC devices are all that picky about voltage.
DC motors run at higher RPMs.
Flashlight (bulb type) are slightly brighter.
Radios and computers have internal power supplies.
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Old 09-09-2019, 10:35 AM
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I took my first old DeWalt 12 V drill/driver that came in a metal box and pop riveted it to the fender under the hood of my old F-150. I gutted the dead ni-cd battery pack and wired it with 20' of heavy duty power cord off one of my dead skill saws, installed battery clamps on the end. Been there a long time and has proved useful on occasion.

Not enough power to be an impact unit, but with an adapter it will run up or off the lug nuts. Drills holes in stuff nicely if they are in reach, or I relocate the battery.

I save at least one dead battery pack case for everything, so I can easily wire up a power source.
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