*Estimates based on standard linear pro-rata depreciation. Actual dealer discounts may vary based on specific percentage slabs (e.g., 50%, 40%).
How the Exide Pro-Rata Warranty Works
Understanding battery warranties can be confusing. Most automotive batteries, including those from Exide, come with a split warranty structure: the Free Replacement Period and the Pro-Rata Period.
This calculator helps you estimate how much you will have to pay for a new battery if your current one fails within the warranty period. The calculation is based on the remaining useful life of the battery relative to its total warranty duration.
Definition: Pro-Rata warranty means you receive a partial discount on a new battery, rather than a free replacement. The discount is proportional to the remaining warranty time.
Warranty Stages Explained
Free Replacement (0 – X Months): If the battery fails during this initial period, the manufacturer replaces it free of cost.
Pro-Rata (X – Y Months): If the battery fails after the free period but before the warranty expires, you get a discount on the prevailing Maximum Retail Price (MRP) of a new battery.
Out of Warranty: Once the total period (Free + Pro-Rata) is over, you pay the full price for a replacement.
How is the Pro-Rata Discount Calculated?
While specific dealer charts may vary (e.g., offering fixed 50% or 25% discounts in specific month brackets), the general mathematical formula for pro-rata value is:
Discount = Current MRP × (Remaining Warranty Months / Total Warranty Months)
This ensures that you only pay for the portion of the battery life you utilized. For example, if a battery with a 48-month warranty fails at month 36, you have used 75% of its warrantied life, so you would typically pay roughly 75% of the new battery's cost.
Important Tips for Claims
To claim your Exide battery warranty, ensure you have:
The original warranty card (paper or digital).
The purchase invoice showing the date of sale.
The battery serial number (usually stamped on the casing).
function calculateWarranty() {
// 1. Get input values
var price = parseFloat(document.getElementById('batteryPrice').value);
var freeMonths = parseFloat(document.getElementById('freePeriod').value);
var proRataMonths = parseFloat(document.getElementById('proRataPeriod').value);
var usedMonths = parseFloat(document.getElementById('monthsUsed').value);
// 2. Validate inputs
if (isNaN(price) || isNaN(freeMonths) || isNaN(usedMonths)) {
alert("Please enter valid numbers for Price, Free Period, and Months Used.");
return;
}
if (isNaN(proRataMonths)) {
proRataMonths = 0;
}
var totalWarranty = freeMonths + proRataMonths;
var statusText = "";
var statusClass = "";
var creditAmount = 0;
var payableAmount = price;
// 3. Calculation Logic
if (usedMonths totalWarranty) {
// CASE: Warranty Expired
statusText = "Warranty Expired";
statusClass = "status-expired";
creditAmount = 0;
payableAmount = price;
} else {
// CASE: Pro-Rata Period
statusText = "Pro-Rata Warranty Period";
statusClass = "status-prorata";
// Linear Pro-Rata Formula:
// Credit is based on the remaining time relative to the Total Warranty
// Standard formula: Discount = Price * ( (Total – Used) / Total )
// Note: Some dealers divide by ProRataMonths only, but Total is the standard fair value calculation.
// We will use Total Warranty as the denominator for a linear depreciation.
var remainingMonths = totalWarranty – usedMonths;
var discountFactor = remainingMonths / totalWarranty;
creditAmount = price * discountFactor;
payableAmount = price – creditAmount;
}
// 4. Update UI
var resultDiv = document.getElementById('results');
var statusSpan = document.getElementById('warrantyStatus');
resultDiv.style.display = 'block';
// Reset classes
statusSpan.className = 'status-badge ' + statusClass;
statusSpan.innerHTML = statusText;
document.getElementById('resTotalWarranty').innerHTML = totalWarranty + " Months";
document.getElementById('resUsed').innerHTML = usedMonths + " Months";
// Formatting numbers
document.getElementById('resCredit').innerHTML = creditAmount.toFixed(2);
document.getElementById('resPayable').innerHTML = payableAmount.toFixed(2);
}