Once you’re there and in adjustment mode, shift the mech until you can hear the chain rubbing slightly on the fourth largest cog. Best practice for this is to shift the chain to the small chainring at the front and the fifth largest cog at the back before you enter adjustment mode. Exactly how long depends on what battery you have, and you can check that here. To enter adjustment mode, hold down the junction box button. Like all rear derailleurs, before you start adjusting anything you need to make sure that the high and low limit screws are in the correct position to stop the chain shifting off the large and small cogs on the cassette. When that happens the systems has a small number of rear mech shifts left to help you get home.Īdjustment mode allows you to fine tune the position of the rear derailleur using the shift buttons. When the battery level is low, the front derailleur will stop shifting first. 25% charge - light illuminates red for 2secs.50% charge - light flashes green 5 times.
100% charge - light illuminates green for 2secs.The junction box light will come on and show you the charge level of the system: To do this you just hold down a shift button for 0.5secs or more (we’d recommend holding down the front derailleur switch for the ring the bike is already in so that the system doesn’t actually try and shift).
Di2 battery status how to#
The first thing to know about the junction boxes is how to check Di2 charge. Those first two junctions are the ones that you’ll see on bikes most commonly under the stem, and the EW-RS910 is the newer junction that fits either in the bar end of your handlebars or, on some frames, in a specific port int the down tube. The other three - SM-EW90A, SMEW-90B and EW-RS910 are the junctions used for charging the system, checking charge level, changing shift mode and entering mech adjustment mode - all the super smart things that make Di2 such an innovative system. One of them - the SM-JC41 is the bottom bracket junction that is used to connect the front and rear mechs and the battery to the cable the runs to the shifters. There are four junction boxes you can use with the latest Di2 systems.
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