Lipo Battery Problem

[Craguss]

Hi All, this is my first post, and just got back from racing at Roundabout in Denton, it was great!

Anyhow, A guy called MArk sold me some cheap LiPo's as I only had the one which I got with the Car (Team Associated B4.1). It came with a 7.2v 20C LiPo battery. That is fine, so I got 3 7.2V 30C LiPo batteris but when I got home just now realised that the connector for the battery is different than the LiPo I have, they are rounded!

Anyone advise as to whether I can use these batteries? Do I need to replace the connectors?

Cheers