cover arrived today well packaged, and boxed cover is about 4 mm thick.
the cover is like a elasicated sleeve you remove battery and insert into the neoprene sleeve.
then refit to frame. all fits quite snug and no doubt will protect from grit and scratches and makes the battery a tad stealthy?
rosebikes.de sell magura bosch battery covers but these are £30inc delivery to uk
its description highlights its thermal properties, dirt, moisture scratch protection.
the only difference is that the magura has a cut out in the cover to access the battery on/off switch ,battery level lights.
one of the comments made re bosch battery covers on amazon was someone bought the cover to hide the brand name , or initials on the battery to make it less of a thief magnet.
A bit of lateral thinking on my part reveals any number of very cheap nylon and neoprene thermos flask covers are available. No time to check sizes at the moment, the sun is shining and I'm out for a ride.