The standard batteries used for vaping are called “18650” batteries. This can be broken into two key parts: 18 and 65. The 18 tells you the diameter of the battery in mm, and the 65 tells you the length of the battery, 65 mm. So an 18650 battery is 18 mm in diameter and 65 mm tall.

“510” refers to the design of the female screw threads built into one end of the battery – 10 x 5mm threads – which is the most compatible type of connection for vape pens around the world. This thread design allows for a tight and long-lasting connection.

21700 – were designed to be a larger and higher capacity replacement for 18650 batteries. Like the 18650, the 21700 has a nominal voltage of 3.6/3.7V. The 21700 was designed to replace the 18650 in EV battery packs. The capacity of these batteries ranges from about 4,000 to 5,000 mAh.

There are different chargers that fit different vape pens so make sure that there is compatibility between the vaporizer/box mod and the charger that is being purchased. While not necessarily a hard task, it is made more difficult when it's a replacement and must be purchased separately from the vape pen itself.

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