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Battery Discharge Formula:
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Battery discharge calculation determines the capacity of a battery based on the current drawn over time. It helps estimate how long a battery will last under specific load conditions and is essential for battery sizing and performance analysis.
The calculator uses the fundamental battery capacity formula:
Where:
Explanation: This formula calculates the total charge capacity by multiplying the constant current by the time duration over which that current is drawn from the battery.
Details: Accurate battery capacity calculation is crucial for designing power systems, estimating battery runtime, selecting appropriate batteries for applications, and preventing premature battery failure due to over-discharge.
Tips: Enter current in amperes (A) and time in hours (hr). Both values must be positive numbers. The calculator will compute the battery capacity in amp-hours (Ah).
Q1: What is amp-hour (Ah) rating?
A: Amp-hour rating indicates how much current a battery can deliver over a specific time period. For example, a 10Ah battery can deliver 1A for 10 hours or 2A for 5 hours.
Q2: Does this calculation work for all battery types?
A: The basic formula applies to all battery types, but actual performance may vary due to factors like temperature, discharge rate, and battery chemistry.
Q3: What is the C-rate in battery terminology?
A: C-rate indicates the charge/discharge current relative to battery capacity. 1C means discharging at a current equal to the battery's Ah rating in one hour.
Q4: How does discharge rate affect battery capacity?
A: Higher discharge rates typically reduce effective capacity due to internal resistance and chemical limitations (Peukert's effect).
Q5: Can I use this for battery runtime estimation?
A: Yes, by rearranging the formula (t = C/I), you can estimate how long a battery will last with a specific load current.