Hi all, new to this site. I have just brought my wife a second hand powabyke, it is not even a year old. The problem is it didn't come with the instruction manual. What we would like to know is does the mains charger plug into the blue box under the seat with the key switch in it or into the silver round battery? thing on the rear rack. I don't want to plug it into to the wrong socket and cause any damage. Cheers in advance. Dave