Hello from fgj.... purchased the Hitec spec TX and spliced the battery wire as have been using airtronics and have a lot of 600 mAH batteries around. Everything connected good until I put the airtronic battery in to the Hitec holder..SMOKE started to come out of the of the TX. Problem was that there it two metal retainers to hold the battery tight in holder. These clips made contact with the bottom of the battery and shorted out the works. Burnt all wire from battery to the splice in less than 4 seconds. Now when I switch batteries there is a plate to seperate battery from the two copper clips...... Live and learn....