We guarantee only the parts of the batteries we repair. For example, if we have changed the BMS card, we only guarantee the BMS card. If we replace 2 out of 10 battery groups, we only give warranty to the group we replaced. However, we still do not cut corners and say that this is not our fault. Instead, we do our best to help our customers. After all, you are using your vehicle with batteries containing 10s, 100s of battery cells. Of course, you should choose a reliable battery service.