How are batteries rated? What are Volts and Amps?
There are two ratings on every battery: volts and amp-hours (Ah). The Ah rating may also be given as milliamp-hours (mAh), which are one-thousandth of an amp-hour (for example, a 1Ah battery is 1000mAh). Amp-hours are a rating of the amount of energy that a battery can store. Another way of looking at it is to say that the higher a battery’s amp-hour rating is, the longer the battery’s run-time will be. Some of our batteries will have higher amp-hour ratings than the original battery found in your device and will not cause any incompatibilities. On the other hand, while the voltage of the Hi-Capacity battery may not be identical to the original battery, the voltages must be within a reasonable range.In order to rate the voltage of the cell, a voltage value between 3.0 and 4.2 must be picked. The voltage that is picked is called the “nominal” voltage, which means that it is for naming purposes only, whereas the actual voltage of the cell depends on the state of charge. Historically some
