Battery size chart

An alkaline AA is at most 14.5 mm across and 50.5 mm long; an AAA is 10.5 × 44.5 mm; a C is 26.2 × 50.0 mm; a D is 34.2 × 61.5 mm. All four are 1.5 V.^{[1 · Oct 29, 2026]}^{[2 · Oct 29, 2026]}^{[3 · Oct 29, 2026]}^{[4 · Oct 29, 2026]}

A hand picks an AAA battery from a drawer organizer sorted into AA, AAA, C, D, 9V and coin cell batteries (AI-generated image)

Everyday sizes

Size	Voltage	Size (max)	Typical weight	Standard names
AA	1.5 V	14.5 mm across × 50.5 mm long max (0.57 × 1.99 in)	23 g (alkaline), 15 g (lithium)	ANSI 15A, IEC LR6 (alkaline); ANSI 15-LF, IEC FR6 (lithium)^{[1 · Oct 29, 2026]}^{[5 · Oct 29, 2026]}
AAA	1.5 V	10.5 mm across × 44.5 mm long max (0.41 × 1.75 in)	11.5 g (alkaline)	ANSI 24A, IEC LR03^{[2 · Oct 29, 2026]}^{[6 · Oct 29, 2026]}
C	1.5 V	26.2 mm across × 50.0 mm long max (1.03 × 1.97 in)	66 g	ANSI 14A, IEC LR14^{[3 · Oct 29, 2026]}^{[6 · Oct 29, 2026]}
D	1.5 V	34.2 mm across × 61.5 mm long max (1.35 × 2.42 in)	139 g	ANSI 13A, IEC LR20^{[4 · Oct 29, 2026]}^{[6 · Oct 29, 2026]}
9V	9 V	48.5 × 26.5 × 17.5 mm max (1.91 × 1.04 × 0.69 in)	45 g	ANSI 1604A, IEC 6LR61 or 6LF22^{[7 · Oct 29, 2026]}^{[6 · Oct 29, 2026]}

Maximum dimensions from each datasheet. Diameter is listed first for round cells; the 9V is height × width × depth.

Coin, button and specialty sizes

Size	Voltage	Size (max)	Typical weight	Standard names
CR2032	3 V	20.0 mm across × 3.2 mm thick max (0.79 × 0.13 in)	3.0 g	IEC CR2032 (NEDA 5004LC)^{[8 · Oct 29, 2026]}^{[6 · Oct 29, 2026]}
CR2025	3 V	20.0 mm across × 2.5 mm thick max (0.79 × 0.10 in)	2.6 g	IEC CR2025 (NEDA 5003LC)^{[9 · Oct 29, 2026]}^{[6 · Oct 29, 2026]}
CR2016	3 V	20.0 mm across × 1.6 mm thick max (0.79 × 0.06 in)	1.9 g	IEC CR2016 (NEDA 5000LC)^{[10 · Oct 29, 2026]}^{[6 · Oct 29, 2026]}
LR44 / 357 button cell	1.5 V (alkaline LR44) or 1.55 V (silver oxide SR44 / 357)	11.6 mm across × 5.4 mm thick max (0.46 × 0.21 in)	1.85 g (A76 alkaline), 2.3 g (357 silver oxide)	IEC LR44 (ANSI/NEDA 1166A); IEC SR44 (ANSI 1131SO)^{[11 · Oct 29, 2026]}^{[12 · Oct 29, 2026]}
CR123A (123)	3 V	17.0 mm across × 34.5 mm long max (0.67 × 1.36 in)	16.5 g	IEC CR17345 (ANSI 5018LC)^{[13 · Oct 29, 2026]}^{[14 · Oct 29, 2026]}
18650	3.6 to 3.7 V nominal (by chemistry)	18 mm × 65 mm (0.71 × 2.56 in)	Varies by cell	Cell format named for its size: 18 mm diameter, 65 mm length^{[15 · Oct 29, 2026]}^{[16 · Oct 29, 2026]}

Reading the names

The same size has several names. Energizer's cross-reference lists its E91 AA as replacing batteries labeled LR6, MN1500, 815 and more, and its 522 9V as replacing codes such as MN1604 and 6LF22.^{[6 · Oct 29, 2026]} The battery cross-reference has the full lookup.
Coin cell digits match the size. A CR2032 is 20.0 mm across and 3.2 mm thick; a CR2016 is 20.0 mm across and 1.6 mm thick.^{[8 · Oct 29, 2026]}^{[10 · Oct 29, 2026]}
Lithium AA is the same size as alkaline AA (IEC FR6 versus LR6), but lighter: 15 g against 23 g.^{[5 · Oct 29, 2026]}^{[1 · Oct 29, 2026]}
Rechargeable Ni-MH AA and AAA are made to the same IEC dimensions as dry cells, but start at about 1.2 V instead of 1.5 V.^{[17 · Oct 29, 2026]}

How long do they keep on the shelf?

Battery	Shelf life the maker gives
Energizer AA and AAA alkaline (E91, E92)	15 years at 21°C^{[1 · Oct 29, 2026]}^{[2 · Oct 29, 2026]}
Energizer C and D alkaline (E93, E95)	10 years^{[3 · Oct 29, 2026]}^{[4 · Oct 29, 2026]}
Energizer 9V alkaline (522)	5 years^{[7 · Oct 29, 2026]}
Energizer Ultimate Lithium AA (L91)	25 years^{[5 · Oct 29, 2026]}
Energizer 123 lithium	Up to 10 years in storage^{[14 · Oct 29, 2026]}

The surest way to buy the right one: read the size off the old battery or the device's manual. Energizer's advice is to replace batteries with the size and type the device maker specifies, all at the same time.^{[6 · Oct 29, 2026]}

Sources: 1. Energizer E91 AA alkaline datasheet (PDF). 2. Energizer E92 AAA alkaline datasheet (PDF). 3. Energizer E93 C alkaline datasheet (PDF). 4. Energizer E95 D alkaline datasheet (PDF). 5. Energizer L91 Ultimate Lithium AA datasheet (PDF). 6. Energizer, Battery cross reference guide (PDF, 2021). 7. Energizer 522 9V alkaline datasheet (PDF). 8. Energizer CR2032 lithium coin datasheet (PDF). 9. Energizer CR2025 lithium coin datasheet (PDF). 10. Energizer CR2016 lithium coin datasheet (PDF). 11. Energizer A76 miniature alkaline datasheet (PDF). 12. Energizer, A76 battery product page. 13. Energizer 123 lithium datasheet (PDF). 14. Energizer, 123 lithium battery product page. 15. Battery University (Cadex), BU-301a: Types of battery cells. 16. Battery University (Cadex), BU-205: Types of lithium-ion. 17. Panasonic Energy, eneloop FAQ. Checked Oct 29, 2026. Inch conversions are our own arithmetic from the millimeter figures. Brand names and trademarks belong to their owners; specs are restated in our own words and tables, not reproduced.