Bingowings said:
Back in 1963 when the Daleks first turned up on Doctor Who they had to figure out a way of showing which Dalek was speaking, they already had the lights on the top so their elegant solution was to have them flash on and off in time with the dialogue.

You could do this with the battledroids, add one colour light for recieving orders from the central computer (maybe with a tiny computer chat sound like the probe droids have) and another colour light flash on in the rare occation that they actually speak (hopefully in a more menacing voice).

The little aerial on their backs may be a good location for this or in the case of the Super-Battledroids on their chest.

They certainly don't need to chat to each other if they are all getting their orders from the same source.

That would be interesting... And not too hard to do either.