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The Most Common Battery Sizes

Here are some details about the most commonly used sizes of batteries - AAA, AA, C, D and 9V. When talking about battery size it usually means the shape, voltage, and terminal connections of a battery.

AAA Size Batteries

Voltage: 1.5 Volts (1.2Volts for NiMH and NiCd)

Shape: Cylindrical

Dimensions: L 44.5 mm D 10.5 mm

Connections: A small cylinder on the + end and flat on the - end

AA Size Batteries

Voltage: 1.5 Volts (1.2 Volts for NiMH and NiCd)

Shape: Cylindrical

Dimensions: L 50.5 mm D 13.5�14.5 mm

Connections: A small cylinder on the + end and flat on the - end

C Size Batteries

Voltage: 1.5 Volts (1.2 Volts for NiMH)

Shape: Cylindrical

Dimensions: L 50 mm D 26.2 mm

Connections: A small cylinder on the + end and flat on the - end

D Size Batteries

Voltage: 1.5 Volts (1.2Volts for NiMH)

Shape: Cylindrical

Dimensions: L 61.5 mm D 34.2 mm

Connections: A small cylinder on the + end and flat on the - end

9V Size Batteries

Voltage: 9 Volts (7.2 Volts for NiMH and NiCd and 8.4 Volts for some types of NiMH and NiCd)

Shape: Rectangular

Dimensions: H 48.5 mm L 26.5 mm W 17.5 mm

Connections: At one end a small + male clasp and a - female clasp