Shimanos Di2 is a revolution in cycling technology. The electronic shifting allows for fast, precise shifting, every time. The Shimano Di2 SM-BTR1 battery pack is the powerhouse of this revolutionary shifting technology. The SM-BTR1 is a 7.4v, high performance lithium ion battery pack that will supply up to 1000km on a single charge. This battery is field tested and proven in the worst weather conditions, ensuring it will keep your Di2 system powered no matter what. This lightweight battery will keep you on your bike and in the lead.FeaturesProven in all weather conditions1000km range on a single chargeLightweight lithium ion technologyEasily removable for rechargingSpecificationsVoltage: 7.4 VCapacity: 530 mAhWeight: 71gTemperature Range: -20 to 60°CNew, Never Used, OEM, This item is exactly as pictured and does not include retail packaging.Shimano