Shimano Di2 External High-power lithium-ion Battery SM-BTR1 / SMBTR1A.
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The Shimano Di2 SM-BTR1 external battery is easy to mount and remove for charging. It is a reliable high-power lithium-ion battery (7,4 V, 500 mAh, 3.7 Wh), with up to 1.600 km of life when fully charged and a 90 minutes charging time. It includes recycling marking, weights only 71 g and it is compatible with the SM-BCR1 charger
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