General ESC Theory Discussion

Ok, I did some rummaging, and found my fried HV maxx controller, so I just stole the cap off of there. It's a 2700uf 25v low ESR (105 C) cap, so I'm guessing that should definitely be a good little cap to install on the mamba max, no? My only issue....I need a hotter iron. The traces on the PCB, the heatsink, and the wire leads themselves suck up WAY too much heat to get anything done. So either I need to use the 100 watt weller soldering gun my dad has, or connect the cap on the actual battery leads.

Any suggestions?