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For example, almost all lithium polymer batteries are 3.7V or 4.2V batteries. What this means is that the maximum voltage of the cell is 4.2v and that the "nominal" (average) voltage is 3.7V. As the battery is used, the voltage will drop lower and lower until the minimum which is around 3.0V.

For example, almost all lithium polymer batteries are 3.7V or 4.2V batteries. What this means is that the maximum voltage of the cell is 4.2v and that the "nominal" (average) voltage is 3.7V. As the battery is used, the voltage will drop lower and lower until the minimum which is around 3.0V.

 a battery that uses reversible cell reactions, allowing them to regain their electrical potential when exposed to passing electric currents. In other words, a rechargeable battery is simply a reversible battery.

They use sensors to measure the weight of an object, and the digital display shows the result. The sensors convert the applied force into a digital readout in mass units such as grams or kilograms. Digital scales are very accurate and can be used to measure even tiny objects