It takes approximately 4 hours to charge an 18650 battery. This can vary depending on how healthy your battery is and what type of charger you use. 

You can check the health of your 18650 batteries by taking note of the time it takes for the battery to charge, how hot it accumulates while charging, and whether or not it holds a charge. You can also search online to buy a 18650 lithium ion cell for flashlights and cameras.

China 18650 Battery 3.7V Li Ion 18650 3000mAh Cell High Discharge 40A 18650 Electric Bike Battery - China Lithium Battery and Li-ion Battery price

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These are indicators that your battery may be reaching the end of its life.

Best Practices for 18650 Battery Storage-

18650 batteries should be kept at room temperature in dry areas. Avoid exposing your batteries to extreme heat or cold. The temperature range from -20 to 50degC, is adequate. However, the best storage temperature is between 77degF and 25degC. 

If you have rechargeable batteries that are used in a flashlight, remove them to be stored separately.

Pro Tip: Don't store batteries in a bag or pocket that contains keys, pins or coins. This could lead to accidental discharge. 

How to safely dispose of batteries?

It is crucial to properly dispose of your 18650 batteries once they have reached their end. They can ignite or release harmful chemicals into the environment. You can dispose of your batteries in many electronic and home improvement stores. These batteries will be sent to recycling centres, where they can be repurposed.