The AA battery (or double-A battery) is a standard size single cell cylindrical dry battery. The IEC 60086 system calls the size R6, and ANSI C18 calls it 15.[1] It is named UM-3 by JIS of Japan.[2] Historically, it is known as D14 (hearing aid battery),[3] U12 – later U7 (standard cell), or HP7 (for zinc chloride 'high power' version) in official documentation in the United Kingdom, or a pen cell.[4]

AA cells

AA batteries are common in portable electronic devices. An AA battery is composed of a single electrochemical cell that may be either a primary battery (disposable) or a rechargeable battery. Several different chemistries are used in their construction. The exact terminal voltage, capacity and practical discharge rates depend on cell chemistry; however, devices designed for AA cells will usually only take 1.2–1.5 V unless specified by the manufacturer.

Introduced in 1907 by The American Ever Ready Company,[5][third-party source needed] the AA battery size was standardized by the American National Standards Institute (ANSI) in 1947, but it had been in use in flashlights and electrical novelties before formal standardization. ANSI and IEC battery nomenclature gives several designations for cells in this size, depending on cell features and chemistry. Before being called AA batteries, they were commonly called Z batteries, as the ones produced by the Burgess Battery Company were sold as "Number Z" (meant to indicate them being smaller than the "Number 1", which was similar in size to a modern C battery).[citation needed] Due to their popularity in small flashlights, they are often called "penlight batteries".


D, C, AA, AAA, AAAA cells, and a 9-volt battery

An AA cell measures 49.2–50.5 mm (1.94–1.99 in) in length, including the button terminal—and 13.5–14.5 mm (0.53–0.57 in) in diameter[citation needed]. The positive terminal button should be a minimum 1 mm high and a maximum 5.5 mm in diameter, the flat negative terminal should be a minimum diameter of 7 mm.[1] 14500 Lithium Batteries are longer if they feature a protection circuit up to 53 mm.

Alkaline AA cells have a weight of roughly 23 g (0.81 oz),[6] lithium AA cells around 15 g (0.53 oz),[7] and rechargeable Ni-MH cells around 31 g (1.1 oz).[8]

Chemistry and capacity


Primary cells


Primary (non-rechargeable) zinc–carbon (dry cell) AA batteries have around 400–900 milliampere hours capacity, with measured capacity highly dependent on test conditions, duty cycle, and cut-off voltage. Zinc–carbon batteries are usually marketed as "general purpose" batteries. Zinc-chloride batteries store around 1,000 to 1,500 mAh are often sold as "heavy duty" or "super heavy duty". Alkaline batteries from 1,700 mAh to 2,850 mAh cost more than zinc-chloride batteries, but hold additional charge. AA size alkaline batteries are termed as LR06 by IEC, and AM-3 by JIS.

Non-rechargeable lithium iron disulfide batteries are manufactured for devices that draw more current, such as digital cameras, where their high cost is offset by longer running time between battery changes and more constant voltage during discharge. The capacity of alkaline batteries is greatly reduced as the discharge current increases, however the capacity of a Li-FeS2 battery is not affected by high discharge currents nearly as much as alkaline batteries. Another advantage of lithium disulfide batteries compared to alkaline batteries is that they are less prone to leak. This is particularly important in expensive equipment, where a leaking alkaline battery can damage the equipment due to the corrosive electrolyte coming into contact with sensitive electronics. Lithium iron disulfide batteries are intended for use in equipment compatible with alkaline zinc batteries. Lithium-iron disulfide batteries can have an open-circuit voltage as high as 1.8 volts, but the closed-circuit voltage decreases, making this chemistry compatible with equipment intended for zinc-based batteries. A fresh alkaline zinc battery can have an open-circuit voltage of 1.6 volts, but a lithium iron disulfide battery with an open-circuit voltage below 1.7 volts is entirely discharged.[9]

Rechargeable cells

Panasonic Eneloop 1.2 volt NiMH rechargeable cells in AA and AAA

Rechargeable batteries in the AA size are available in multiple chemistries: nickel–cadmium (NiCd) with a capacity of roughly 600–1,000 mAh,[10] nickel–metal hydride (NiMH) in various capacities of 600–2,750 mAh[11][12] and lithium-ion. NiCd and NiMH provide 1.2 V; lithium-ion chemistry has a nominal voltage of 3.6–3.7 volts, and AA-sized cells of this voltage are coded 14500 rather than AA. AA-sized lithium-ion cells with circuitry to reduce the voltage to the 1.5V of standard replaceable cells are also made.

NiMH and lithium-ion AA/14500 cells can supply most of their capacity even when under a high current drain (0.5A and higher), unlike alkaline and zinc-chloride ("Heavy Duty"/"Super Heavy Duty") cells which drop to a small fraction of their low current capacity before even reaching 1 C.[13][14][15][16]



A Li-ion 1.5V AA-size battery, sold by the Chinese company Kentli as "Kentli PH5" since 2014 and with similar batteries later available from other suppliers is a AA-sized battery housing containing a rechargeable 3.7 V Li-ion cell with an internal buck converter at the positive terminal to reduce the output voltage to 1.5 V.[17] The Kentli batteries expose the normal 3.7 V Li-ion electrode in a ring around the AA electrode to allow charging by a special charger. It supplies the same 1.5 V as a fresh disposable alkaline AA cell, but with virtually no drop over the discharge cycle, unlike other disposable or rechargeable cells. Its lithium-ion chemistry provides a low self-discharge of 3% per month.[18] Its capacity at 250 mA drain is 1,700 mAh at 1.5 V, less than other chemistries, limited by the low efficiency of the step-down converter.[19] Some later Li-ion AA batteries advertise their capacity in milliwatt-hours (mWh) instead of the usual milliampere-hours (mAh), so a customer's attention is drawn to the figure, typically a claimed 3,000 or more, which is in reality 2,000 mAh.

By 2023, several brands of 1.5 V Li-ion rechargeable batteries in both AA and AAA sizes (with voltage converting circuitry in even the small AAA casing) were available. They use various charging methods, without the special Kentli ring third electrode. Some have special chargers—a charger for a 1.2 V cell will not provide sufficient voltage—but do not use a third electrode.[20] Others have a USB port built into the cell itself.[21]



Nickel-zinc cell (NiZn) rechargeable 1.65 V AA and AAA cells are also available, but not widely used. They require a charging circuit capable of supplying that voltage.


Chemistry IEC name ANSI/NEDA name Nominal voltage (V) Capacity under 50 mA constant drain (mAh) Max. energy at nominal voltage and 50 mA drain (Wh) Rechargeable
Zinc–carbon R6 15D 1.50 400–1,700 2.55 No
Alkaline LR06 15A 1.50 1,800–2,850 3.90 Some
Li-FeS2 FR6 15LF 1.50 2,700–3,400 5.10 No
Li-ion ??R15/50 14500 3.60–3.70 600–1,100 (1,600 mAh at 1.5V) 3.88 Yes
LiFePO4 14500 3.2–3.3 600–1,000+ 2.80 Yes
NiCd KR6 15K 1.20 600–1,000 1.20 Yes
NiMH HR6 15H 1.20 600–2,750 3.42 Yes
NiZn ZR6 ? 1.60–1.65 1,500–1,800 2.97 Yes

In 2011, AA cells accounted for approximately 60% of alkaline battery sales in the United States. In Japan, 58% of alkaline batteries sold were AA, known in that country as tansan (単三). In Switzerland, AA batteries totaled 55% in both primary and secondary (rechargeable) battery sales.[22][23][24]

Bounce test


In zinc alkaline AA batteries, a zinc gel slowly turns into a ceramic as power is consumed. This means that fully charged batteries do not bounce when dropped onto a hard surface, but fully discharged batteries do. Because the transition occurs gradually and non-linearly, a bounce does not mean that a battery is fully depleted, but a non-bounce does mean it has charge left. Researchers at Princeton University produced a video showing bounce height with each 10% of discharge.[25]

See also



  1. ^ a b Classic (LR6) datasheet from
  2. ^ "What are UM3 Batteries?". Ask Media Group, LLC. 4 August 2015. Retrieved March 29, 2020.
  3. ^ "Eveready D14 Hearing Aid "A" Battery".
  4. ^ Blaukatz Battery Encyclopaedia
  5. ^ "About Eveready®". Eveready. Archived from the original on May 9, 2017. Retrieved August 8, 2017.
  6. ^ "Energizer Alkaline AA Battery Specification" (PDF). Product Datasheet. Energizer. Retrieved October 21, 2015.
  7. ^ "Energizer Lithium AA Battery Specification" (PDF). Energizer. Retrieved October 21, 2015.
  8. ^ "Energizer NiMH AA Battery Specification" (PDF). Energizer. Retrieved October 21, 2015.
  9. ^ Lithium Iron Disulfide Handbook and Application Manual, Version LI4.04, Energizer Battery Manufacturing Inc.
  10. ^ Bergveld, H; Kruijt, W; Notten, P (February 1999). "Electronic-network modelling of rechargeable NiCd cells and its application to the design of battery management systems". Journal of Power Sources. 72 (2): 143–158. Bibcode:1999JPS....77..143B. doi:10.1016/S0378-7753(98)00188-8.
  11. ^ "Panasonic NI-MH Handbook- Industrial batteries" (PDF). Panasonic. 2014. pp. 22–55.
  12. ^ "2018–2019 Panasonic Catalog" (PDF). Panasonic Batteries. pp. 32–43, 60–62.
  13. ^ "Test of Eneloop AA HR-3UTGB 1,900mAh (White)". Retrieved 2019-02-13.
  14. ^ "Test of Keeppower 14500 840mAh (Black) 2014". Retrieved 2019-02-13.
  15. ^ "Test of Duracell Ultra Power AA". Retrieved 2019-02-13.
  16. ^ "Test of Panasonic Super Heavy Duty AA CAN". Retrieved 2019-02-13.
  17. ^ Gin, Jason (7 December 2014). "Teardown of Kentli PH5 1.5 V Li-Ion AA battery". Rip It Apart - Jason's electronics blog-thingy. Retrieved April 24, 2018.
  18. ^ Gin, Jason (2 May 2018). "Completed: Self-discharge test of Kentli PH5 1.5V Li-ion AA (Part 6)". Rip It Apart - Jason's electronics blog-thingy.
  19. ^ Gin, Jason (17 June 2015). "Performance analysis/review of Kentli PH5 Li-ion 1.5V AA battery". Rip It Apart - Jason's electronics blog-thingy.
  20. ^ Review & Teardown: Tenavolts AA Size 1.5V Li-ion battery (13' Video). 18 June 2019 – via YouTube. Analysis of performance and charging, and teardown, of a 1.5V Li-ion cell
  21. ^ Witherspoon, Thomas (12 April 2022). "Pale Blue Earth Li-Ion AA Batteries Review". QRPer.
  22. ^ Absatzzahlen 2008 INOBAT 2008 statistics.
  23. ^ "LIFE CYCLE IMPACTS OF ALKALINE BATTERIES WITH A FOCUS ON END‐OF‐LIFE" (PDF). 3 March 2016. Archived from the original (PDF) on 3 March 2016.
  24. ^ "BAJ Website - Monthly battery sales statistics". Archived from the original on 2010-12-06. Retrieved 2011-06-13.
  25. ^ Mark Lorch (April 8, 2015). "It turns out there's truth to 'dead battery bounce' after all". The Conversation.