My Air Stream battery is going bad. I've had it rebuilt once but have seen conversions done using a smaller battery and attaching that to the helmet. I'd like to look into that. While I'm not the sharpest knife in the drawer regarding technology and things electrical, I do have a friend that is. Can anyone recommend an accurate video or tutorial about how to do it that I can give to him rather than trying to explain it myself? While there are videos available, I'd appreciate feedback from those who know regarding a good one. Thank you so much.