Seatpost Battery Holder

Seatpost Battery Holder

Non-series components BT-HLDR

Whether you run 11-speed Di2 or 12-speed Di2, chances are pretty good that you have a seatpost battery - either the BT-DN110 10-/11-speed or the BT-DN300 (12-speed).

If you do, you could tuck away the battery in the seatpost using a piece of cloth or foam and be done with it. Alternatively, you can install a seatpost battery holder.

I tend to use the battery holders, just because I like my battery to be really secure. They're relatively inexpensive and work really well.

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