fungus:
sandworm:
I picked up a 9v 2200ma battery to replace the piles of standard 9vs I've been going through. When I plugged it in, my arduino started to smoke, but I was able to unplug it in time to prevent permanent damage.Ummm, if smoke came out then there's permanent damage...
Not if its a resistor that smokes - they can often burn off their coating and still work. An overhot PCB trace can burn
off the solder-resist and still work (if lucky).
I agree it sounds like the battery pack wasn't connected to the right pins the right way round...