I own the tower hobbies 30 dollar charger and I converted all my connectors on my rustlers components (and charger) to deans connectors. I have noticed that the batteries overheat and the clear plastic wrapper around them has melted. I am wondering if the charger is puting to much juice in them at once or what. It could also be the batteries too. They are tenergy 4200's. I am wondering if it wasn't a good idea to convert the charger over to deans connectors. I have not the slightest idea. Can anyone help me. Also I have a mamba maxx 5700 installed if that helps. Thank You!!! Here is a picture of the battery charger. http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXJC34&P=ML As for the batteries they are Tenergy 8.4v 4200's. I converted all my connectors to deans because the Mamba Maxx motor fried the stock tamiya connectors on my truck. I am positive I did not reverse the polarity. It would have started on fire a long time ago. I have put about 20 runs in the truck so far. So the idea of me reversing the polarity is impossible. Any other ideas on what my problem is?