Some brands offer their devices, mostly LED flashlights, but there are other devices as well, with special battery adapters/holders that allow these three batteries to fit the same battery compartment, allowing the user to power the device with the most suitable battery/batteries. Now, the dimensions are not that different! When comparing 18650, CR123A, and AAA batteries, it is very important to start with their physical dimensions:Īs one can see, when two CR123A batteries are placed one on another, one gets a battery pack with physical dimensions of ~17 x 69 mm.Īlso, when three AAA batteries are placed next to each other, they fit the cylinder that features a diameter of ~22 mm which is 44.5 mm high.
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Note: when somebody refers to "AAA battery", generally one refers to the non-rechargeable 1.5V AAA battery based on the zinc-carbon or more commonly alkaline chemistry.Įach of these chemistries has its own pros and cons - for more about these batteries, feel free to check our AAA Batteries - Size, Chemistry Types, and Replacements article. Some brands also offer rechargeable CR123A batteries often labeled as RCR123A with a nominal voltage between 3.2 and 3.7 volts and a capacity of 500-800 mAh.įor more information about these batteries, feel free to check our Best CR123A Battery - Rechargeable vs Non-Rechargeable Lithium CR123A Batteries article.ĪAA batteries are cylindrical batteries with physical dimensions of (D x H) 10.5 x 44.5 mm, while nominal voltage and capacity depend on the exact battery chemistry, as given in the following comparison chart: CR123A batteries are known for their ability to provide strong currents even after a long time of not being in use. Physical dimensions of the CR123A battery are (D x H) 17 x 34.5 mm, with a nominal voltage of 3.0V and nominal capacity of ~1500 mAh (~1.5 Ah).ĬR123A battery is a non-rechargeable battery, with a shelf life often of 10+ years.
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When they are not in use, it is recommended to recharge them every 3-6 months.įor more information about these batteries, feel free to check our How to Pick the Best 18650 Battery and 18650 Battery Charger article. Physical dimensions of the 18650 battery are (D x H) 18 × 65 mm (0.70866 x 2.5590 inches), while nominal voltage and capacity depend on the actual battery chemistry and the type and vary between 3.2 and 3.7 volts and generally between 3000-6000 mAh (3-6 Ah).ġ8650 battery is a rechargeable battery with some models intended as high-capacity low-drain batteries or as high drain, low-capacity batteries. Features and Specifications of 18650, CR123A, and AAA Batteries
Nonetheless, having a device that supports two or more battery types allows the user to choose the best battery (or batteries) according to the intended use of the device or, in emergencies, allows the user greater freedom in finding at least "some" kind of battery in order to power the device. 18650 Battery vs 2x CR123A Batteries vs 3x AAA BatteriesĪt first, 18650, CR123A and AAA batteries are very different cylindrical batteries - they differ in physical dimensions, chemistries, nominal voltages, capacities, discharge characteristics and also have other features that differ significantly.
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