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A good while ago I read that Sram have a patent on mechs with removable batteries or mechs with on board batteries.
This was apparently what was stopping shimano from being able to go fully wireless. Does anyone remember reading such an article? I now can't find it.
The patents in the article linked above seem to show two versions, mechs with on board batteries and then one with a frame mounted battery.
The frame mounted battery would be similar to the electronic fsa groupset, wireless communication but still wired to a battery on the frame.
But the mechs with on board batteries make me wonder if shimano really will be able to release a fully wireless group. There's no mention if the on board batteries are removable.
TotalShanner
It could also be considered puppy killing since he drills holes in the frames