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An N battery (or N cell) is a standard size of dry cell battery. An N battery is cylindrical with electrical contacts on each end; the positive end has a nub or bump on the top. The battery has a length of 30.2 mm and a diameter of 12.0 mm, and is approximately three-fifths the length of a AA battery.
A zinc-carbon battery in this type is designated as R1 by IEC standards; likewise, an alkaline battery in this type is designated as LR1. ANSI designates this battery as 910A and 910D for alkaline and zinc-carbon chemistries, respectively. Energizer calls this type E90.
Mercury batteries of the same dimensions are no longer manufactured because of their toxicity. Former mercury cells such as the Mallory RM401, Duracell RM-401, IEC-MR1, etc. were supplanted by the alkaline Kodak KN.
Rechargeable N-size batteries are also available, in nickel-cadmium (KR1) and nickel-metal hydride (HR1) chemistries. However, these are far less common than other rechargeable sizes. Rechargeable N-Series batteries may be charged in a AA charger using a makeshift adapter (such as a small metal slug or a spring). Some universal battery chargers (with spring-loaded contacts) are also able to charge N size batteries.
Common uses for this size of battery include some small flashlights, remote control door chimes, glucose meters, small desk clocks, wireless microphones, laser pointers, some vintage calculators, and film cameras.
An N-cell battery has a similar size to the A23 battery, which has a 12 V output.