The dimensions for 9 volt batteries are H 48 mm Ã— L 25 mm Ã— W 15 mm (1.9 in Ã— 1 in Ã— 0.6 in). However these standards still allow for varying in size for a 9 volt battery. The maximum size permitted, for example, is 48.5 mm Ã— 26.5 mm Ã— 17.5 mm.
Alkaline, Advanced Lithium or Rechargeable, Energizer has the 9v battery for your energy-hungry devices that demand higher voltage.
"9V" is the physical size/shape, not the actual voltage. An alkaline 9V is really 9 volts, but a rechargeable "9V" battery is initially 9.6V, 8.4V, 7.4V, or 7.2V, depending on the model in question. In the rest of this discussion, "9V" refers to the 9V size, not the actual voltage. 9.6V (NiMH).
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Originally Answered: Why do some cells of different size have same voltage?. Multi-cell batteries such as the 9V rectangular battery have 6 small cells inside, .