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mAh or Milliampere/Hours

A milliampere-hour mA┬Ěh or mAh; is a unit of electrical charge often used in rechargeable battery specifications. It indicates the batteries capacity to deliver current over the period of one hour, thus a battery that has a rating of 650mAh has the capacity to deliver 650mA for 1 hour into a standard load. The batteries actual capacity will vary depending on many factors so the mAh rating is only a guide to indicate capacity.