Dry cell is a voltaic cell, using some absorbent (such as wood chips or gelatin) will not spill the contents to become a paste. Often used as flashlight lighting, radios and other power supply.

Dry chemical power belongs to the original battery is a disposable battery. Because of this chemical is a power supply unit which can not flow in the electrolyte paste, so called dry cell, which is relative to a flow of electrolyte to said cell. Batteries not only for flashlights, transistor radios, tape recorders, cameras, electronic bell, toys, etc., but also for national defense, scientific research, telecommunications, marine, aviation, medical and other various fields of the national economy, is very easy to use.

Ordinary batteries are mostly zinc battery, the middle is the positive carbon rod, outsourcing, a mixture of graphite and manganese dioxide, and then a layer of outer webs. Online electrolyte coated with a very thick paste, which forms is ammonium chloride solution and starch, a small number of preservatives is the outermost layer of zinc metal tube made ​​of leather, which is the negative electrode, the battery discharge is ammonium chloride and zinc electrolysis reaction, releasing the charge transfer to the anode made ​​of graphite carbon rod, zinc electrolysis reaction is will release hydrogen gas, which gas is associated with increased battery internal resistance, and mixed manganese dioxide and graphite is used to absorb hydrogen, but if the battery used continuously or for too long, too late or manganese dioxide nearly saturated incapable of re-absorption, and this time will be due to the internal resistance of the battery and the output current is too small and too useless, but this time If the battery heat, or place for some time, it will be heated internal accumulation of hydrogen release or slow release. manganese dioxide also to restore a recovery, and that the battery will have energetic!