For the charging on internal SHIMANO DI2 batteries (BT-DN110), the SM-BCR2 also serves as a PC linkage device for E-TUBE PROJECT firmware updates and settings.
Battery charger for BT-DN110 PC linkage device for E-TUBE PROJECT to update firmware and customize setting
![Dolphin Charger Premium Series Dolphin Battery Charger - 12V, 60A, 110/220VAC - 3 Outputs [99050]](https://www.bmtelink.shop/image/dolphin-charger-premium-series-dolphin-battery-charger-12v-60a-110220vac-3-outputs-99050_18123j_285x.webp "Dolphin Charger Premium Series Dolphin Battery Charger - 12V, 60A, 110/220VAC - 3 Outputs [99050]")