2020 Mercedes-Benz EQ B spied

Mercedes-Benz's practical plug-in, the 2020 EQ B, has been spied testing alongside the EQ C on snowy roads. Although we've seen what look like plug-in hybrid B-Class models in past, this is the first time our spy photographers have managed to snap a pure-electric model. How do we know? The big sticker saying 'electric' on the windscreen is only applied to electric Mercedes prototypes, for one.