Checking battery life is easy: press the button on the Shifter. Green light means it’s at or close to full charge. Red light means it’s at or close to half charge. And flashing red means charge it up. The battery will last approximately 20 hours or more of riding time. To prolong battery life, the system goes to power save mode when the bike is stationary. It is also possible to check battery life through the AXS App.