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Battery Discharge Time Formula:
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Battery discharge time refers to the duration a battery can power a device before needing recharging. It's calculated based on the battery's capacity and the rate at which current is drawn from it.
The calculator uses the fundamental battery discharge formula:
Where:
Explanation: This formula provides the theoretical maximum discharge time. Actual runtime may vary due to factors like temperature, battery age, and discharge characteristics.
Details: Calculating battery discharge time is essential for designing power systems, selecting appropriate batteries for applications, and estimating runtime for electronic devices and backup power systems.
Tips: Enter battery capacity in Ampere-hours (Ah) and discharge rate in Amperes (A). Both values must be positive numbers greater than zero for accurate calculation.
Q1: Why is actual discharge time often less than calculated?
A: Factors like battery efficiency, temperature, age, and discharge curve characteristics can reduce actual runtime compared to theoretical calculations.
Q2: What is C-rate in battery terminology?
A: C-rate indicates the charge or discharge current relative to the battery's capacity. A 1C rate means discharging at a current equal to the battery's Ah rating.
Q3: How does temperature affect battery discharge time?
A: Lower temperatures typically reduce battery capacity and discharge time, while higher temperatures can increase self-discharge and reduce overall lifespan.
Q4: Can this calculator be used for all battery types?
A: This calculator works for lead-acid, lithium-ion, NiMH, and other battery types, though actual performance may vary between chemistries.
Q5: What is Peukert's effect?
A: Peukert's law describes how battery capacity decreases at higher discharge rates, which is particularly relevant for lead-acid batteries.