At what percentage of battery degradation can BYD batteries be replaced for free?
2 Answers
BYD Company has introduced a free battery replacement policy. As long as the battery performance degrades by more than 20%, customers can visit BYD's 4S stores for a free battery replacement service, ensuring the vehicle maintains optimal driving performance. The battery mainly consists of a casing, power management system, cooling system, and battery cells, primarily used for energy storage. However, the power management system, cooling system, and casing are also crucial. Without these systems, the battery cannot function properly. If the battery degrades during the vehicle's warranty period, it can be repaired or replaced for free. Battery capacity degradation can also be considered as cell degradation. While the cells are covered by a lifetime warranty during replacement, other components are subject to the vehicle's three-guarantee policy. Replacing the cells may not be a straightforward process and could involve replacing other components as well. BYD will refuse to honor the lifetime warranty under any of the following circumstances: Change of vehicle ownership, meaning the owner is not the first owner (the buyer listed on the new vehicle purchase invoice); the vehicle is used for non-private purposes (such as official, commercial, or racing use); failure to follow the user manual and service within the maintenance period at authorized service centers; unauthorized parts used for repairs; failure to register BYD Cloud Service and Di Fan Hui; the vehicle's total mileage exceeds 30,000 kilometers within any 12-month period; failure to repair the vehicle at an authorized BYD service center after an accident; normal battery capacity degradation; repairs to the three-electric system related parts due to human or accidental collisions, floods, fires, and accidents.
BYD offers free battery replacement if capacity degrades below 70%, with a warranty period of 8 years or 160,000 kilometers (whichever comes first). Having driven a BYD EV for 4 years, my friend just qualified for a new battery under this threshold. Free replacement requires an official test report confirming significant capacity loss. Driving habits matter – routinely charging to 100% or draining to 0% accelerates degradation, so maintaining 20%-80% charge is wiser. Annual capacity ratio tests at BYD-authorized shops using professional equipment can monitor battery health. My car still retains 85% capacity, proving durable, but this policy provides peace of mind against expensive replacements, making long-distance EV travel more reassuring.
