We recommend controlling the charging status by the LED on the charger, not on the device. 
Note that RGB headbands/vests, Alphatag headbands/vests can be charged only by FireFly chargers and Li+ chargers.  

Smart RGB headband LED colors means the following:

• Glows Green - the battery is full;
• Blinking Green - charging in progress;
• Blinking Yellow - low battery voltage, charging in progress;
• Blinking Red - error.

Yellow and Green sometimes look the same.

Anyway, if the headband is blinking red, but the LED on the charger is red, keep charging.