Panasonic LR1 Battery This popular small 'N' type battery is commonly used in clocks & alarms with a shelf life of up to eight years. Type: Alkaline. Voltage: 1.5 V. Length: 30.2 mm. Diameter: 12.0 mm. Also known as: LR01 / MN9100 / N / E90 / 4001 / KN / KN-2 / AM5 / 810 / 910A.