Battery Size Calculator — Free Online Tool
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Battery Size Calculator

Calculate required battery capacity based on load and runtime

Formula: $\text{Capacity (mAh)} = \text{Current Draw (mA)} \times \text{Desired Runtime (Hours)} \div \text{Efficiency Factor}$. A real-world safety factor (~80% efficiency) is factored in.
Load & Runtime Parameters

Calculation Results

⚠️ For educational purposes only. Actual battery requirements may vary due to temperature, discharge rates, and component efficiency.

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