+nnn-nnn+
Might try to add another N again anyhow.
Attatched is a pic of it in action. I used almost 1 liter of water, half cup baking soda (I don't have any KOH on hand yet).
Yes, the solution is probably quite strong, but I wanted to see it kick up.
I recharged my battery (it was down to 7v) and I think its going out, as it went from 12v down to 8 in about 3 minutes which might explain why there was so little heat. Either way, there it is.