If you have re soldered it then I recommend driving for a short time (30 seconds) and then have a good feel of all the electronics and make sure nothing is overheating.
If you did melt the solder then you either had a bad connection or the battery was getting very hot, either way its not a good idea to let the car get this hot again. If you are pulling enough amps to melt solder then your pulling enough amps to kill your cells and ESC.
The chances are that you just had a bad solder joint and once re soldered you wont have the same problem again.
You should never need to use silver solder on RC car connectors, if anything is getting hot enough to melt standard solder then something is wrong.
You may need solver solder if you are rewiring a motor armature, but thats a bit more specialised.
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