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Genuine manufacturing defects represent less than 1% of batteries sold and the majority of batteries presented as potential warranties are suffering in-application faults with faulty charging systems, battery abuse or they are being used in incorrect applications. Be mindful too, that the older the battery, the less chance it has of being a manufacturing fault.
To aid your warranty adjudication process, enter the vehicle registration or customer's surname & postcode and you can review the stated purchase date and vehicle odometer information and confirm if details and warranty period are correct.