AA.

Possibly the most common size of consumer battery.
New Lithium types are available with considerably more capacity than the earlier Zinc and Alkaline types, but at a higher cost.
NiMH rechargeables are available in 2700 mAh and greater capacities which will give long life but the voltage is .3 of a volt less per battery. This compounds with the more batteries used, for example: 6 × 1.5 (9 volts) becomes 6 × 1.2 = 7.2 volts.

Equivalents:

1.2H2, 15A, 15AC, 15D, 15LF, 10015, 815, 824, 4006, 4014, 4106, 7522, AA, AM3, BA3058/U, E91, EN91, FR6, HP7, HR6, K6A, KAA, KR157/51, L91, LR06, LR6, LR6A, LR6N, Penlight, Mignon, MN1500, MX1500, NX1500, R06P, R6, Stilo, SUM3, ZR6,

Image
not to scale. Common
Name. Dimensions.
Length × Diameter. Chemical Composition. Nominal Voltage.

AA. 50.5 mm × 14.5 mm
Contacts:
Pip Positive.
Flat opposite end Negitive.
Zinc Carbon
Zinc Chloride
Alkaline
Lithium
NiCd
NiMH
1.5 volts.
1.2 volts
(NiMH and NiCd).

Image not to scale.	Common Name.	Dimensions. Length × Diameter.	Chemical Composition.	Nominal Voltage.
	AA.	50.5 mm × 14.5 mm Contacts: Pip Positive. Flat opposite end Negitive.	Zinc Carbon Zinc Chloride Alkaline Lithium NiCd NiMH	1.5 volts. 1.2 volts (NiMH and NiCd).

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