The battery is too cold or too hot to use or charge.
When the battery temperature is -10°C to 70°C degrees, it can be used. When the battery temperature is 5° C to 50°C degrees, it can be charged again.
Use the battery charger in ambient temperatures between 5°C (41°F) and 40°C (104°F).
Outside the above limits, the battery will not be able to charge or discharge properly.