There's a 3S protection board located in the boiler wired up to the charge and balance charge sockets. I always use protection boards with my battery locos even though I use an intelligent IMAX B6 charger and the Deltang receivers have low voltage cut off sensing for lithium packs built in. I prefer overkill when it comes to using li ions. I even include an additional fuse to protect against accidental short circuits. Belt and braces!Are you going to add a protection board to the Peckett? Clearly there is none in those pictures. Just asking after the "more than happy" statement.
Maybe you meant internal protection boards in each cell?