Sparked Lipo, Melted Connectors, HELP!

[EBoardBro]

So I connected a 5000Ah 3s LiPo to a 120A Hobbyking Car ESC, and it made a big spark. I melted all of the bullet connectors. What could the issue be?

My soldering may have been iffy. I didn't remove the solder(tinning, whatever it's called) that it comes with from the factory. I just stuck the ends in the bullet connectors and soldered. Would that be the cause?

I am so close to finishing this board, and now this.

Thanks for the help!

 

[piyiotisk]

There always going to be a spark if you dont use an anti spark system. Look at the XT-90s connector and you will be fine you only need one when you are closing the circuit

 

[EBoardBro]

I figured it out. Dumbass me connected negative and positive backwards. I'm lucky that nothing is ruined.

 

[torqueboards]

I figured it out. Dumbass me connected negative and positive backwards. I'm lucky that nothing is ruined.

I was just gonna say that. If your connector melted it's most likely due to a short.