Looking for AC adapter or battery charger


I have a problem.. I have 4 powerbooks in the 500 series, they all have batteries but no ac adapters. Every google search I have done have all come up with adapters with the small connector. Yet the power connectors on the powerbooks are the larger type.. When I get home sunday, I will look at one of them and get the pin count.

Either that or if someone can tell me a part number for a battery charger for the 500 series, I would appreciate it very much.