C Rate Calculator

C Rate Calculator

The C rate, often referred to as the C-rate, is a parameter used to describe the rate at which a battery is charged or discharged relative to its capacity. It's a way to standardize charging and discharging speeds, making it easier to compare battery performance across different devices and manufacturers. A 1C rate means the battery is charged or discharged in one hour. A 2C rate means it would be charged or discharged in half an hour, and a 0.5C rate means it would take two hours.

Result:

Enter the battery capacity and the C-rate value to see the equivalent charge/discharge current.

function calculateCRate() { var capacity = document.getElementById("batteryCapacity").value; var cRate = document.getElementById("cRateValue").value; var resultDiv = document.getElementById("result"); resultDiv.innerHTML = ""; // Clear previous results var capacityNum = parseFloat(capacity); var cRateNum = parseFloat(cRate); if (isNaN(capacityNum) || isNaN(cRateNum) || capacityNum <= 0 || cRateNum <= 0) { resultDiv.innerHTML = "Please enter valid positive numbers for battery capacity and C-rate value."; return; } // Convert mAh to Ah for easier calculation with Amps var capacityAh = capacityNum / 1000; // Calculate the current in Amps var currentAmps = capacityAh * cRateNum; resultDiv.innerHTML = "Battery Capacity: " + capacityNum.toFixed(0) + " mAh" + "C-Rate: " + cRateNum.toFixed(2) + "C" + "Equivalent Charge/Discharge Current: " + currentAmps.toFixed(2) + " A"; } .calculator-container { font-family: sans-serif; max-width: 600px; margin: 20px auto; padding: 20px; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); } .calculator-form { margin-bottom: 20px; padding-bottom: 20px; border-bottom: 1px solid #eee; } .calculator-form h2 { text-align: center; margin-bottom: 15px; color: #333; } .calculator-form p { font-size: 0.9em; color: #555; line-height: 1.5; margin-bottom: 20px; } .form-group { margin-bottom: 15px; } .form-group label { display: block; margin-bottom: 5px; font-weight: bold; color: #444; } .form-group input[type="number"] { width: calc(100% – 22px); padding: 10px; border: 1px solid #ccc; border-radius: 4px; font-size: 1em; } .calculator-form button { width: 100%; padding: 12px; background-color: #007bff; color: white; border: none; border-radius: 4px; font-size: 1.1em; cursor: pointer; transition: background-color 0.3s ease; } .calculator-form button:hover { background-color: #0056b3; } .calculator-result h3 { margin-bottom: 10px; color: #333; } #result { background-color: #f9f9f9; padding: 15px; border-radius: 4px; border: 1px solid #eee; min-height: 80px; display: flex; align-items: center; justify-content: center; text-align: center; } #result p { margin: 5px 0; font-size: 1.1em; color: #333; } #result strong { color: #28a745; }

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