Shimano Dura‑Ace SM-BTR1-A 530 mAh 7.4 V Di2 Shifter Power Pack

A slim 7.4 V lithium‑ion pack with 530 mAh capacity powers Shimano Di2 electronics for Ultegra and Dura‑Ace groupsets. Its compact, rugged housing mounts easily to the frame, while a quick‑connect interface ensures hassle‑free installation and reliable power delivery during long rides.

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