Originally Posted by
Steve B.
Is this a button mounted on a battery that itself is mounted inside your seat tube ?, and do you then need to remove the seat post as well as battery ?.
Perhaps the older downtube external batteries had the button?
But the newer seatpost battery setups use the front junction box that's normally mounted under the stem. It has a charging USB port on the side, a red/green status light, and a setup button on the bottom surface. (There appear to be aftermarket mounts to avoid the strap around the stem.)
And you can check the charge level by holding down a shift paddle for a couple of seconds, even while riding.
An example found on the web:
