There are two ways to check the shifter’s battery level - the first is using the E-Tube Cyclist mobile app, and the other method involves pressing buttons on the shifters itself. My preferred method is to use the buttons on the shift lever itself, so I’ll show that first.
The hydraulic shifters have wireless functionality, and this works using a CR 1632 battery. Replacing this battery is an easy affair, and takes about two minutes. There’s a guide showing you how to replace the battery below, but if video is.
The 105 and 12-speed GRX shift levers have twobatteries, and they'll last a very long time. You are unlikely to ever need to replace them. If yours ran out of juice.
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