one Switch Usage Instructions
1. The battery should have the positive terminal facing inward (towards the lamp head) and the negative terminal facing outward (at the tail).
2. The switch is at the rear. The switch function is the switch function. Pressing the switch lightly is the dimming function.
two Circuit Board Usage Instructions
The flashlights in our store adopt advanced voltage stabilization and constant current technology, which can effectively meet the requirements of LED flashlights for voltage stabilization and constant current.
2. Special Notes: a. Do not use under overvoltage. The voltage should not exceed 4.2V. b. The battery should be placed with the front end facing forward. Do not reverse it, otherwise the board may burn out. c. Pay attention to controlling the temperature changes of the flashlight to ensure heat dissipation. d. Non-professionals are not allowed to open the circuit board
3. Warranty Description: Open or processed circuit boards are no longer covered by the warranty

Three Lithium Battery Usage Instructions
1. Characteristics of lithium batteries: The charging methods of lithium batteries are completely different from those of mobile phone batteries. Lithium batteries have no memory effect and can be charged at any time. Do not overcharge or overdischarge them.
2. The first charge should last at least 6 hours. After that, it's fine as long as the green light on the charger is on. There's no need to overcharge.
3. Special reminder: Use a charger with "three-proof" features that prevent overcharging, reverse connection, and short circuit.
4. If the battery is not used for a long time, it should be fully charged and stored. It is normal to charge and discharge it once every three months or so.