5700 meltdown

So i hade some troubles at the track today. I got 1 lap in an my sc10 shutoff i went back to the pits an noticed that my car had a smell to it. I took the body off an noticed that the bullet plugs on my reedy 4900 35c battery were melted an leaning over. Only thing i can think of is a couple of days before that my on off switch ripped out so i had to solder it back on i think mabey the solder is to close or touching the red power wire come off the esc. Any help ? i hope i did not destroy my battery an esc.