The robots should be able to use inductive charging to recharge, that would eliminate the power port and also make it easier for them to recharge themselves....You could set a condition that if it's battery drops below a certain level it would find it's dock and recharge.....the inductive part (LOL not so sure about the technical aspects) could be in the feet or underside the robot would basically just have to stand or sit in the right spot, no need to line up jacks or anything like that!!
By dmzimbelman
Other robots from Synthiam community

Richiesrc's Phoebe & Rich's Wall-E Progress Pics
G.day everyone, Here are the progress photos. will add to this post as we go along. This and the next one are the same...

Ezang's RGB Arduino, Python Code With ARC
Here is an example of using the ARC serial monitor I am using an Arduino, Python code, with ARC - watch the R G B light...

Moviemaker's Well, It Is Obvious That I Did Not Sell My V3,...
I made another scrap robot. Here are the pictures. She is made from parts of the Sunshine Robot, parts from the...