More like a bomb.
So, apparently, they did indeed start up full-scale testing of their carefully selected batteries.
But it took less than one month for the first of them to blow up in flames and force tens of thousands of inhabitants to stay hidden indoors to avoid the toxic cloud that resulted from this experiment.
One of the mainstream newspapers has reported a press release of the Electrabel-Engie group saying that the “battery that has burned was not in operation at the time the fire broke out”. Let’s hope that at least this one is fake news, otherwise it would mean that these batteries are just chemical bombs ready to explode at any time.