WF-501B CREE Q5 200 Lumens Single-Mode LED Lights (1X18650 battery not included)
Strongly suggest you using the protected battery for it can really protect the battery well and extend the battery life as well as avoid the over-charging and over-discharging of the battery. Please never over-charge or over-discharge the 18650 and 16340 batteries, which means when the brightness of the flashlight is going down clearly but not totally dark, it is the time to charge it, or the battery will be over-discharged and it will break or short-circuit when you charge it the next time. To prevent recharging problems, please do not mix old and new batteries or ones with different types. Insert the batteries must be based on the mark to position the positive (+) and negative (-) terminal. Remove battery if not in use for long period. Please avoid impacting and falling. After long time lightening, please don't touch its glass to avoid scald your hands.