Hi, I do not have an hpi baja but rather the clone brand rovan.(sorry HPI guys, I needed to post this somewhere, it can happen to anyone). Today I must have overcharged the nimh reciever battery and one of the cells exploded about a foot away from my face. I noticed it smoking in the battery box and attempted to get the lid off so the damage would be minimal. < Worst idea I've ever had. The cell exploded, deafening me for maybe 10 seconds, so I got the fire extinguisher and sprayed the hell out of it. Ironically, I had just received the super bee remote kill switch in the mail 4 hours previously but had forgotten to get the mail which saved me 60 bucks, because otherwise I would have installed it once I got it. So, this is a warning... Don't over charge your batteries!