Deans connectors are good for nearly anything. Use with confidence. They are a bit hard to solder, and you will need a good soldering iron.
Soldering GUNS are junk, period. They are worthless.
The goal is to have a large mass of metal that is very hot from which to transfer heat to the items being soldered. Guns have a tiny little tip that cools instantly when touched to the item being soldered. Then you have to hold it there for a couple of minutes, all the while any plastic in the near vicinity melts, and your fingers get burned from holding everything in place. Guns are terrible.
Get a pencil style soldering iron that has a 1/4" or 6mm diameter tip with a chisel point. Don't get one of those cheapy irons with the tiny 1/8" conical tip (like the ones at Radio Shack). The classic Weller 40 watt is good. The 80 watt is awesome for soldering batteries, but the tip is much too big for doing wire to connector soldering.