Battery Safety Precaution* Using 4.2V li-ion direct drives the LED and yields maximum output at the expense of extensive heat generated from the LED. Limit each usage to less than fives minutes (or less than one minute each with freshly charged li-ion for the first couple times). Active cooling (blowing cool air toward the light) or passive cooling (holding the light in your hand) helps preventing excessive heat built at the LED. Turn off the light to allow it to cool down if you find the flashlight too hot to hold. Do not leave the light running unintended with li-ion. During direct drive, output at low and medium mode will be higher than normal.

All EagleTac flashlights are designed to use “button-top” battery (battery with protruding positive terminal). For rechargeable li-ion battery, use only EagleTac li-ion battery, or other protected li-ion battery with compatible length and diameter. Before using the battery, check and ensure the battery outer wrapping (the isolating plastic film that wraps around the metal housing of the battery) is complete. Broken battery wrapping may lead to short circuit and damage to the flashlight.

Lithium and Li-ion battery can explode or cause burns if disassembled, shorted, or exposed to high temperature. Do not mix new and used batteries. Do not mix batteries with different brand, capacity, voltage, or install batteries backwards.

NiMH rechargeable battery may release gas during discharge. If you experience an inflated switch boot or find high pressure being built inside the flashlight, switch off the flashlight immediately. Slowly loosen the tail-cap to reduce the internal pressure and replace all batteries