Most battery connectors are custom made, i.e. home made. If you are trying to match what is in you plane you will need to figure out what you have currently. Power Poles are becoming standard, Cinch round connectors are also still common. Once you figure that out you can order some and find a friend that can fab one up for you. Most of us also put the same connectors on the charger so you plug directly into the charger as well.