Some batteries come with connectors, some don't. Your's didn't. The ends of the wires are simply tinned (with solder) and they have shrink tubing around the ends to keep the battery from shorting out. They don't have crimp connectors, and I wouldn't recommend using them.

You will have to install the type of connector you want. You can get a JST connector with leads and solder it to the battery leads. Or you could get a Deans Ultra connector (or other connector which comes with both sides) and solder it to your battery and to your Blade.