1. I received the cat ct2405 flashlight as a gift. I did not receive operating instructions. How do i know when battery is fully charged? Charge indicator lights are red/amber/green after 18 hours charging. HELP! By terry smithThe LED light indicators are used as a gauge. When 3 are lit, it is fully charged. When 2 are lit it has 2/3 battery life. When only 1 LED is lit, the battery is low.