I think, I being a risk averse type of person, would agree with Alan and Jonno regarding the introduction of LiPo batteries in heavyweight robots. Even if the FRA approves them the EO's could say No thanks at my events.

From A safety perspective it is all down to control of risk for instance the Big Nipper team can run LiPo batteries in Big Nipper safely because, they are fully trained engineers with high quality equipment using the batteries in a fire proof type custom aluminium case, fitted to a titanium armoured robot! but what about the people from other backgrounds that don't have the knowledge or funds to run them with the same safety considerations. (Don't get me started on the high pressure gas equipment fitted in the robots these days.)

Either people have to be trained to use these potentialy dangerous things safely, or they are should be left to the flying set.

It's a hobby guys, let's not kill anyone!