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 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.
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.