There are many different types of connectors on the market. The charger manufacturer has no way to know which one you have, and to include them ALL would raise the price of any charger by $50, making it less likely that someone would buy their charger. So, they just give you a place to plug in your own custom charge leads.

www.rcbatteryclinic.com is a good place for some basic battery information. You'll also want to keep an eye on the forums, reading threads that catch your eye. The most up-to-date information is kept right here.