Silent Jack

No, lead acid batteries are far too heavy.  I was looking at maybe NiMH or more likely some LiPo batteries commonly used on RC cars and the like.  Looking at 3-6AmpH class batteries.  Might lean towards 12V, since there is so much standard stuff for that as far as wiring and other components.  Safety is of course important and any good suggestions on grounding/shielding are welcome and appreciated.

[i would not encourage children to develop high tech weaponry and would firmly discourage them from using them on themselves or others.]  I saw a project online once that took a page from the XREF taser shotgun rounds, concept.  It used pressurized air to propel a charged disposable camera capacitor, prongs first out of a simple barrel.  Interesting concept, though from what I read, the 330V would be far to little to achieve the taser effect.  That and I understand a specific waveform is needed to affect strictly skeletal muscle and not cardiac muscle.  Seems like a safety concern to me.