If you're getting shocked by your SMPL mod, something is wrong. I can't suggest troubleshooting techniques, but I'm sure one of the gurus will be by shortly to assist. I can only say make sure the center pin on the tank/atty extends BEYOND the threads. If it is too close to the same length the battery top can flex in and short out against the threads and will fry (literally) the battery. Also, make sure the center pin isn't spring loaded. that's about all I know about SMPL mods.