18650
First of all 18650 is actually the size or the battery 18mm by 65mm.
These batteries are usually used for electronic cigarettes but it needs to have a high voltage.
Furthermore you will notice that is the same shape with an AA battery but a bit larger.
Even though they have the same size, these batteries can have different power.
Finally, the 18650 batteries are rechargeable.
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Batteries
Sony 18650 VTC6 High-drain Li-ion Battery 30A 3000mAh
Original price was: €15.00.€11.99Current price is: €11.99.