1/2 AA and 14250 Batteries Equivalents and Replacements
1/2 AA and 14250 batteries are small, cylindrical batteries commonly used in some flashlights, medical instruments, security devices, dog collars, movement monitors, and other applications where a relatively small, but reliable battery is required.
1/2 AA and 14250 batteries come in several chemistries, each differing in the nominal voltage, capacity, and few other important details.
Published: February 19, 2021.
1/2 AA and 14250 Batteries Features and Specifications
1/2 AA and 14250 batteries feature physical dimensions of (D x H) 14.0 x 25.0 mm (~0.5512 x 0.984 inches), with the maximum allowed diameter of 14.5 mm (0.5708 inches).
Commonly these batteries are labeled as '1/2 AA' or 14250 battery, but other labels are used as well, including CR14250, ER14250, LS14250, etc.
'1/2 AA' label is obvious - 'AA' battery nominal dimensions are (D x H) 14.5 × 50.5 mm (~0.57 × 1.99 inches), double the length of '1/2 AA' batteries.
1/2 AA and 14250 batteries come as non-rechargeable and rechargeable batteries, depending on their exact chemistry:
- LiMnO2 (Lithium Manganese Oxide) battery is a non-rechargeable battery with a nominal voltage of 3.0 volts and a nominal capacity of 800-1200 mAh. Output voltage is very stable, with a very low self-discharge rate, sometimes even less than 1% per year - some models come with a 10+ year shelf life. These batteries are also sometimes labeled as CR14250 batteries.
- LiSOCl2 (Lithium Thionyl Chloride) battery is a non-rechargeable battery with a nominal voltage of 3.6 volts and a nominal capacity of 1000-1200 mAh. It also features stable output voltage, with an extra-low self-discharge rate, often less than 1% per year, with many models featuring 10+ year shelf-file. These batteries are also often labeled as ER14250 batteries.
- Lithium-ion rechargeable batteries feature a nominal voltage between 3.2 and 3.7 volts (3.6 volts being most common) depending on the actual battery chemistry and capacity of ~300 mAh. Unlike non-rechargeable batteries, lithium-ion batteries can be recharged up to 500-1000x. But, due to the lower capacity, they must be replaced more often. Also, they feature a much larger self-discharge rate when compared with LiMnO2 and LiSOCl2 batteries.
Due to the voltage difference, not all devices that are powered by 3.0 volts 1/2 AA batteries support the use of 3.6 volts 1/2 AA batteries - most of them do support both battery voltages, but just in case, if you have a device powered by 3.0 volts 1/2 AA battery do not replace the battery with 3.6 volts battery unless explicitly stated by the device's manufacturer that both voltages are supported.
If You are looking for a new 1/2 AA or 14250 battery, always go for the batteries from reputable manufacturers - they are popular batteries, used and tested by many users in real-life situations.