[htwoopup]

Yes, Terry’s website is great. And he explained it wonderfully above.

That said, before I discovered the better shifting site I was confronted with your battery question.

If you have a non-di2 seatpost, there is also a ghetto way of putting a battery in it….wrap it in bubble wrap and put some tape around the bubble wrap squeezing the wrap and making sure it is on there. Obviously, use the amount of wraps of bubble as you need to firmly hold the battery in the post.

Another ghetto trick is run some thin diameter but sturdy string over the battery and bubble wrap inside the post with the two tail ends dangling out so that you can easily pull the battery out if you ever want to.