Check Di2 shifter battery levels and replace them
12-speed wireless shifter batteries last about two years. This page shows you how to check the battery level on your shifters, and replace the batteries.
Disc Brake Dual Control Lever (Wireless)
GRX ST-RX825
Twelve-speed GRX Shift levers feature one SD300 port, one satellite shifter port, and three shift buttons.
The third button isn't on top of the shifter but on the inside, where you would rest your thumbs.
Like the 105 Di2 shifters, these GRX units take two CR1632 batteries. They should last for about 3.5 - 4 years.
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Wired compatibility
If you've looked at the compatibility information for 12-speed Di2 then you might've noticed that ST-RX825 has no official wired compatibility.
Regardless of what the compatibility information says, you can in fact wire up these shifters no problem. They'll show up in E-Tube Project as you'd expect, and shift wired just fine.
Specifications
- Model code: ST-RX825
- Series: GRX RX825
- Weight: 207g (per shifter)
- SD300 ports: 1
- SD300 satellite shifter ports: 1
- Battery: CR1632 (2 per shifter)
- Wired shifting: Maybe? (see description)
- Wireless shifting: Yes
- Servo wave: Yes
- Free stroke adjust: Yes
- Reach adjust: Yes
- Brake type: Disc
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