Below are the three color combinations used to indicate battery charging status.
The bright red LED indicates the battery is charging
The bright green LED indicates the battery is fully charged
The combination of the red and green LED's at a lower intensity (slight amber hue) indicates a charging fault has been detected
Charging fault: If the LED indicates a fault place the diagnostic tool in the standing position when charging. When placed in the standing position the unit will have better air flow. This allows the unit to better dissipate heat and avoid a temperature related charging fault. If the diagnostic tool is being charged in a high temperature environment or an enclosed space with no air flow it may be necessary to relocate it to a cooler location. The temperature related charging fault is triggered at 113°F (45°C) and will prevent the battery from being charged.