ORIGINAL: nonstoprc
Here is a [link=http://www.youtube.com/watch?v=MnldHRtjre8]video[/link] on how to solder bullet connectors. My personal preference is 4mm bullet for all my battery packs, the ESC and the motor.
Depending on what packs you are buying, 4mm or 5mm bullet connectors are pre-installed.
This is good, however I'd like to see it done with 12 or 10 gauge wire! Not quite so easy.