The ones in your first link, show a connector for wire to wire, although i have seen people use them for batts.
The ones you bought, are for connecting wire to batt although if your a good solderer you maybe able to use them for wire to wire, but it maybe untidy and not a brilliant connection.
As james says, the only reason you need to connect wire to wire is for a quick motor change, and a stickpack battery pack like in the first link.