We’re working with a Raspberry Pi 2 and someone voiced a concern over how much power was too much power. If anyone knows this it would be great if you could let us know!
The docs for the RPi 2 should list the input voltage specs. Stay within that and you’re fine. It’s likely a 5V input (though I don’t know for certain)
Get a 12v to 5v (Or adjustable) buck converter. The pi takes 5v only.