Saturday night I had my Spektrum DX4S at the drift track and it was working fine. Tonight I get it out and turn it on to center the wheels on the YD-2 so I could set the front toe. The DX4S would not come on. My first thought was that I left it on and the batteries were dead. When I opened the bottom to take the batteries I out I noticed that the tension springs were collapsed, stretched them back out and put some new batteries in and still wouldn’t fire up. I’m thinking WTF did this thing take a dump on the ride home. I then noticed that the batteries were getting hot, this shouldn’t happen. It says to me there is a a short somewhere. Proceed to take it appart when I finally get all the screws loose so I can remove the battery holder. I start looking around and the wire from the battery holder go to the circuit board for the switch. Upon further inspection I see a glob of soldier shorting between the positive and negative. It appeared that it came like that from the factory, why it worked at all is beyond me, maybe it just was barley not touching and during the ride home it bounced enough to cause the short. I went in with a pair of nippers and cut the soldier bridge out. Put some batteries in and tried it, this time the power light lit and the DX4S powered up. Removed the batteries and took the hot glue gun and put a glob of glue over the soldier joints to use as an insulator. This did the trick and the Spektrum DX4s is now working again.