A common technique to handle high peak currents is to use a capacitor to offload the power source. During high current periods the capacitor will act as the primary power source, while during low current periods the battery will be the primary power source and recharge the capacitor.
When dimensioning the capacitor, it is important to know the battery’s internal resistance and the load profile. With this information it’s quite simple to dimension a suitable capacitor.
In a low cost application, this capacitor size would probably be too large or too expensive, but in a real application the capacitor can be significantly reduced depending on application, since the load profile is much easier. The resulting schematic is shown in the below figure.
Conclusion:
So adding a capacitor enables a circuit to handle high internal resistance and maximize battery capacity of coin cells, and also bringing the average current down is therefore the most important factor when maximizing battery life of coin cells in low power applications.
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