Firstly sorry to hear you are experiencing difficulties with your Lithiumax product! For warranty claims, please send us an email to: email@example.com with the following details: 1. Battery Serial No. (Available on the battery label). 2. Purchase location and date. 3. Proof of purchase. 4. Installation details. a. Vehicle or equipment battery is installed in. b. Engine capacity and alternator/generator specs if non-OEM. c. Vehicle application e.g. Circuit race car, drag car, road car, boat, aircraft etc. d. Time battery operated correctly. 5. Circumstances that lead to the battery no longer charging or starting engine. 6. Estimate of time battery was below 8 volts. 7. Current battery voltage. 8. Name, Phone No. and address. We will then reply with either further questions or RMA no. and return address. Thank you!