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 are manufactured in different sizes for use in
torches, radios, remote control devices and other portable electronic gadgets
as shown below.
 |
| Relative sizes of dry cell |
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