Shimano XTR DI2 Battery Case (Under bottle for Internal Battery SM-BTC1)

Universal Cycles -- Shimano SM-BTC1 Di2 Bottle Cage Battery Mount [ISMBTC1]

Di2 Battery for sale

Assembling the SM-BTC1 Di2 battery holder

Shimano Di2 Battery Case for Water Bottle Mount Sm-btc1 for sale online

The 2nd generation Di2 e-Tube wiring system from Shimano has the SD300 designation. These wires and connectors are thinner than the SD50 generation. if you need to join two wires to one (3 total wires), or two pairs of SD300 wires to create a longer length for both pairs (4 total wires), you will need this EW-JC304 Di2 SD300 4-Port Junction Box.

Shimano EW-JC304 Di2 SD300 4-Port Junction Box

First Look: Shimano XTR Di2 Electronic Shifting for MTB - Mountain Bike Feature - Vital MTB

Shimano Sm-btr2 Di2 E-tube Internal Battery for sale online

Universal Cycles -- Shimano SM-BTC1 Di2 Bottle Cage Battery Mount [ISMBTC1]

Using the external bracket SM-BTC1, the internal battery SM-BTR2 be attached externally. The bracket provides a low profile design. Junction B

Shimano SM-BTC1 external Battery Bracket for SM-BTR2 (internal)

Shimano BT-DN110A1 Internal Di2 Battery

Shimano XTR Di2 1 x 11 setup