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@hippy
"This item does exactly what it's supposed to and charges my Di2 battery quickly and efficiently. It charges it from no battery to full power in about 40 minutes. Only use this to charge the battery, DO NOT set it to sync with the Shimano ETube configuration as it messes up your system and then you have to reinstall and update all your Di2 components just with a PC cable from Shimano (which is EXPENSIVE). So just use this to charge the battery and do not use any ETube project/app while you have it charging and the battery is in use and then it will work perfectly."