AAA.

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 quite high 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:

24A, 24D, 24LF, 4003, 824, AAA, AM4, E92, EN92, FR03, FR3, HP16, K3A, LR03, LR3, Micro, Microlight, MN2400, MX2400, R03, R03P, R3, SUM4, UM4,

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

AAA. 44.0 mm × 9.0 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.
	AAA.	44.0 mm × 9.0 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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