12v from power tool battery?

[MR2FC]

Apologies if this has been discussed before, but I was wondering about charging RC cars from my Ryobi batteries?

I've seen these...

Google Search

...Anyone have any experience of such a thing?

Thanks in advance!

 

[johnre]

Buck converters are a pretty standard technology, and this device should do as advertised. Just be sure you size it to handle the maximum current draw the RC cars are set to take.

I'm presuming you're away from your vehicle and you're looking for something portable that you can carry to produce 12 V in the field. So just curious here - rather than using a fairly expensive setup like this with a Li Ion 18 V battery and this converter, and dealing with the conversion losses it will have, why not just carry a cheap 12 V lead-acid battery?