Are AA batteries the same as 18650?

Some people always asked, are AA batteries the same as 18650? No, AA battery is an ordinary No. 5 battery, and rechargeable batteries are nickel-metal hydride, nickel-cadmium, nickel-zinc, etc. 18650 battery is a cylindrical battery of diameter 18mm and height 65mm, usually we think it is a common 18650 lithium battery.

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