4.2.3 Manganese-alkaline cell The manganese-alkaline cell is commonly available, under several brand-names, as the 'popular long life battery' e.g. trade names Energizer, Duracel etc. Its construction is more complicated than that of a Leclanché cell as below. Manganese-alkaline cell The positive terminal at the top of the cell is connected to a dense layer, near the outside of the cell, consisting of compressed manganese dioxide and graphite. An absorbent separator cylinder is followed (working inwards towards the middle) by a paste of zinc mixed with potassium hydroxide. This is connected to the bottom of the cell by an internal post, riveted or welded to the bottom of the cell. The e.m.f. of a manganese alkaline cell is 1.5V. This cell’s capacity, or service life, is many times better than that of Leclanché cell in most applications and secondly, it can be stored for a long time, up to 3 years, without losing its original capacity. Dry Leclanché and manganese-alkaline cells ...