There are two conclusions you can draw about Rossi's demo ~ (1) he played on the widespread ignorance even among scientists of what modern line batteries are all about ~ and got away with it, or (2) he actually knows something about those big line batteries not generally understood ~ to wit, there have been other reports about anomalous energy production ~ which might have something to do with what goes on with electronic charge levels inside a really dense environment.
Could be both ~ 5.5 hours was the giveaway for me, and at the time I posted pictures of line batteries that looked just like the one he used.
There still remains the question of what really is taking place in these excess heat experiments.