First off, it is not a 'charger' it is merely the plug at the end of the cable.
Second, there have been four or five of these fires. In each case the wires in the wall overheated, melting their insulation and eventually causing a short at which point the in-house breaker will trip.
But, before that, the house wiring, outlet in its wall box and the tesla provided plug will start melting, releasing smoke and possibly catching fire.
What is the problem ? There are multiple ones
-wrong gauge of wire being used. Too thin. Wire 'ampacity' is one of these whacky definitions that the electric code uses. A 8 gauge wire has this 'ampacity', a 6 gauge a larger one.
Problem is 'ampacity' is defined as allowed current for a given time to prevent damage.
So an 8 gauge may be able to do 30 amp (i am just picking a random number here, i don't know what it really is) but only for 2 hours in a 24 hour period for a longer operation it may fall to 25 amp.
This also changes if it is free wire or wire run in a conduit.
To avoid the potential problem tesla instructs to use the commercial usage ampacity table. That table is for 24/7 loads like ovens in restaurants. You will see that the wire will need to be made a lot thicker.
Since the tesla can sit there pulling power for 8 to 10 hours ....
The same is to be said for the outlet. There are residential grade and commercial grade. Tesla instructs to use commercial grade. These are still using hard bakelite-like self extinguishing materials and oversized copper blades. As opposed to flimsy pressed sheet iron
They give you a nice document to give the electrician with the guidelines on what should be used.
Problem is , people are penny pinching , do-it-yourself installers, or the electricians think they know better and use whatever they have laying around.
And then you get melting wires...
Now, i do agree that tesla should have put a thermal fuse in the plug from the get go. Better safe than sorry.
At least they are correcting it and we will all get a new set of plugs for free.