![]() No, these aren't some sort of weird, AA battery, this is actually a 18650 Lithium Ion Cell. South Georgia and the South Sandwich Islands.Personally, it may be great to have an option to choose between the batteries, but the 18650 battery simply stores much more energy than the AA battery and should be a preferred choice for many devices and gadgets.This product has shipping restrictions, so it might have limited shipping options or cannot be shipped to the following countries: So, if You are going to replace the single 18650 battery with the battery adapter holding one AA battery, be aware that the output power and the amount of energy are going to be decreased. NiMH (Nickel Metal-Hydride) AA battery, 1.2V 2000 mAh: 2.4 Wh, etc.Īs one can see, the main difference between 18650 and AA batteries is the difference between the amounts of stored energy, with some models of 18650 batteries being able to store 14.8 (or even more) Wh of energy, while the best AA batteries are unable to store more than 5-6 Wh of energy. NiOOH (Nickel Oxy-Hydroxide) AA battery, 1.5V 2500 mAh: 3.75 Wh, But, since they feature a relatively high self-discharge rate and are prone to leakages, they are mostly replaced by alkaline AA batteries, although they are still available on the market.īecause of differences in size and chemistry, 18650 and AA batteries are able to store different amounts of energy: Note: one of the oldest AA battery chemistries is Zinc-Carbon chemistry with a nominal voltage of 1.5V and a typical capacity of 600-1600 mAh. "Standard" AA battery is a non-rechargeable alkaline AA battery featuring a nominal voltage of 1.5V and a typical capacity of 1800-2700 mAh. Since lithium chemistries don't suffer from memory effect, 18650 batteries may be recharged as soon as one can put them in the charger, assuming that they are not too warm or too cold.ĪA batteries feature physical dimensions of 14.5 x 50.5 mm (~0.571 x 1.988 inches) and are available in numerous chemistries as shown in the following comparison chart: Which type suits your needs, You have to find it by reading the manual of the device you have. Since lithium-ion batteries are relatively sensitive to charging and discharging conditions, some 18650 batteries feature a small Battery Management System (BMS) that protects the battery from unwanted events - such 18650 batteries are called "protected 18650" batteries.Īlso, 18650 batteries differ in the form of the positive terminal - there are "flat top" batteries and "button-top" batteries. But, is this actually a good idea?ġ8650 and AA Batteries Features and Specificationsġ8650 batteries are rechargeable lithium-ion batteries featuring physical dimensions of 18.6 x 65.2 mm (~0.732 x 2.567 inches), a nominal voltage between 3.2 and 3.7 volts, and a nominal capacity between 18 mAh. In order to simplify finding the batteries for their devices, some manufacturers ship their 18650 devices (mostly flashlights) with an AA battery holder that allows AA batteries to be used in the 18650 battery compartments. Both 18650 and AA batteries are cylindrical batteries that differ in size and that come in various types of battery chemistries, thus differing in the battery voltage, capacity, and other charging/discharging characteristics.
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