Cheat Sheet: 12-speed battery checks

To check a shift lever battery, press-and-hold both buttons on that shift lever for 0.5 seconds or more.

The LED on the shift lever will then indicate the battery status.

• Green: 11% to 100% battery
• Red: 1% to 10% battery level
• No LED: 0%

If your shifter LED turns red, you have about a month to go before it’ll go completely flat - buy a new CR1632 (Amazon | eBay) and replace that battery as soon as possible.

Here is more information on checking and changing wireless shift lever batteries.

Check 12-speed main system battery status

To check the 12-speed main battery charge, press the button on the rear derailleur for 0.5 seconds or less.