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Is anyone familiar with the battery for the Fenix TK16 flashlight?

This is a 5000mAh battery, 21700 3.6V 18Wh

I am specifically asking about charging via USB cable. How do I know when the charging is complete, if there is no built-in LED that would light up in the appropriate color?

This is a 5000mAh battery, 21700 3.6V 18Wh

I am specifically asking about charging via USB cable. How do I know when the charging is complete, if there is no built-in LED that would light up in the appropriate color?

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In general, there are several ways to recognize whether charging the Fenix TK16 flashlight battery using a USB cable is complete, even if there is no built-in indicator. 1. Charging time: Check the charging time specified in the Fenix TK16 flashlight's instructions. If the time has passed, it can be assumed that charging is complete. 2. Voltage test: During charging, the battery should gradually charge. You can observe the voltage on the USB charger using a voltage meter. If the voltage exceeds the nominal value, it is a sign that charging is complete. 3. Interrupting charging: If you are unsure whether charging is complete, you can interrupt the charging for a while and check if the battery loses charge in a short time. If it does, it means the battery is charged. 4. Temperature monitoring: During charging, the battery might heat up. If the temperature starts to significantly rise during charging and gradually stabilizes, it is a sign that the battery is charged. Please note that the above methods are more general and may not be specific to the Fenix TK16 flashlight. Therefore, it is always a good idea to check the user manual or consult the manufacturer if you have any doubts.
In general, there are several ways to recognize whether charging the Fenix TK16 flashlight battery using a USB cable is complete, even if there is no built-in indicator. 1. Charging time: Check the charging time specified in the Fenix TK16 flashlight's instructions. If the time has passed, it can be assumed that charging is complete. 2. Voltage test: During charging, the battery should gradually charge. You can observe the voltage on the USB charger using a voltage meter. If the voltage exceeds the nominal value, it is a sign that charging is complete. 3. Interrupting charging: If you are unsure whether charging is complete, you can interrupt the charging for a while and check if the battery loses charge in a short time. If it does, it means the battery is charged. 4. Temperature monitoring: During charging, the battery might heat up. If the temperature starts to significantly rise during charging and gradually stabilizes, it is a sign that the battery is charged. Please note that the above methods are more general and may not be specific to the Fenix TK16 flashlight. Therefore, it is always a good idea to check the user manual or consult the manufacturer if you have any doubts.

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