Rechargeable Batteries

Rechargeable batteries come in many different designs using different chemistry. They are sometimes called storage battery or secondary cell. Recharging non-rechargeable batteries may cause the battery to explode. Additionally, one must be careful to recharge a rechargeable battery before it is completely discharged, or reverse charging may occur. Some rechargeable batteries need to be fully discharged every so often to maintain the ability to deeply discharge

mAh = A milliamp-hour (abbreviated as mAh) is the measurement of how long a battery will last (or in the case of a rechargeable batteries, how long it will last between charges). A milliamp is one thousandth of an ampere, the SI unit of electric current. A milliamp-hour is the quantity of charge that passes either terminal of the battery when a one-milliamp current flows for one hour.

The energy capacity of the battery is measured in milliampere hours (mAh). The higher the mAh number, the longer the rechargeable batteries will hold and provide its rated charge. Digital cameras need AA batteries with 1,800 to 1,900 mAh.

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