Power capacity is how much energy is stored in the battery. This power is often expressed in Watt-hours (the symbol Wh). A Watt-hour is the voltage (V) that the battery provides multiplied by how much current (Amps) the battery can provide for some amount of time (generally in hours). Voltage * Amps * hours = Wh.
The way the power capability is measured is in C 's. A C is the Amp-hour capacity divided by 1 hour. So the C of a 2Ah battery is 2A. The amount of current a battery 'likes' to have drawn from it is measured in C. The higher the C the more current you can draw from the battery without exhausting it prematurely.
Figure 1. Using an analog multiplier to measure battery discharge power. In the example of Figure 1, using an AD534 multiplier, with impedance differential inputs, the total load on the battery is RL + RSENSE. The voltage drop across R SENSE, applied to the X input, measures the current through load R L.
To accurately measure the instantaneous current output of a battery using a multimeter, follow these steps: Prepare the battery and multimeter: Ensure the battery is disconnected from any circuit. This is to prevent any external circuitry from affecting the measurement. Set up the multimeter: Set the multimeter to measure DC current.
What is the best formula to calculate the output energy from a battery?The best formula to calculate the output energy from a battery is by using the Peukert factor. This formula states that the output energy from a battery is just the voltage times the battery's capacity in watt-hours. There is an amount of energy stored in the battery.
If you desire to measure the battery's terminal performance as it is being discharged at constant power, a power-measuring circuit like Figure 1 can be used in a feedback loop to enforce the constant power constraint. Figure 2 shows a circuit for discharging a battery at a controlled power level.
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