The basic functionality of the button lights is to indicate the State of Charge (SoC). 

The SoC has the following colour indicators: 

• Blue steady light: Fully charged 
• Green steady light: Medium charged 
• Red steady light: Low on charge 
• Red flickering light: Almost empty/empty 

State of Charge is also visible on your display and in the Veloretti app. 

User instructions for older batteries: 

• Press the button two times to activate the 'entry mode' of the battery.
• Pressing the first time shows the SoC (which could be any colour mentioned above) 
• Pressing the second time will make the green light flash, meaning the battery will go into 'entry mode' and be deactivated for 10 seconds. 
• You can now place the battery into the frame in all safety.
• Once in the frame, the battery will activate again after 10 seconds.