I have heard people complaine about this in the past, I assumed they either got a defective unit or misshandled it somehow..

I have been singing the graces of how great the charger is.recomended it to all my friends and all U guys online.

My charger was sitting on the table charging batteries, working perfectly as always. Took my merv out for a bash, came back in to charge the batteries, hadn't moved, touched or even looked at the charger. Now its making HORRIBLE fan noises.

So I guess there all prone to this issue. Not sure if its a design flaw, or poor quality control on traxxas part. Gonna try and fix it myself.