A solid red light means that the battery is charging and below 80%. ... If your Makita charger light is flashing red, this means that the battery is either too hot or too cold to charge.

Fortunately, the battery can cool while on the charger, and once it reaches a safe temperature, should begin to charge automatically --with the blinking green light replacing the solid red one.

On the other hand, some solid lights mean that charging is ongoing, such as red (battery is below 80% charge) and red + green (battery is above 80% charge). Lastly, a solid green light indicates a ...