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Recharging alkaline batteries
Most alkaline batteries available are disposable, designed to be used until exhausted, then discarded. There are also rechargeable alkaline batteries, designed to be recharged, which are not covered by this article.
Disposable alkaline batteries are classed as primary batteries; manufacturers do not support recharging, and warn that it may be dangerous.〔Duracell disposable alkaline cells are marked "Do not ... charge ... Battery may explode or leak."〕 Despite this advice, alkaline batteries have successfully been recharged, and suitable chargers have been available.〔(Description and test of a charger sold for recharging disposable alkaline batteries. ) It was tested by discharging batteries until completely dead, and recharged them successfully, to lower capacity than original capacity, a few times. Other chargers warn that they "will revive partially discharged batteries, but will not restore completely dead" ones. ()〕 The capacity of a recharged alkaline battery declines with number of recharges, until it becomes unusable after typically about ten cycles.
== Charging current ==
Low-ripple direct current is not suitable for charging disposable alkaline batteries; more suitable is a current pulsed at a rate of 40 to 200 pulses per second, with an 80% duty cycle. Pulsed charging appears to reduce the risk of electrolyte—usually potassium hydroxide (KOH)—leakage. The charging current is low to prevent rapid production of gases that can rupture the cell. Cells that have leaked electrolyte are a safety hazard and unsuitable for reuse. Fully discharged cells recharge less successfully than only partly depleted cells, particularly if they have been stored in a discharged state —battery charger manufacturers do not claim to recharge dead cells.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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