What are the battery replacement conditions for the BYD Tang?

[KyleLynn]

BYD Tang uses lithium iron phosphate batteries with a warranty policy of 8 years or 150,000 kilometers, and the battery cells are covered by a lifetime warranty. If the battery has degraded to a certain extent before reaching the replacement cycle, it will be replaced for free. However, if the battery needs to be replaced due to non-natural factors or human damage, it will not be replaced for free. The battery capacity of the Tang has been increased to 18 kWh, providing a pure electric range of 85 kilometers. The cycle life of lead-acid batteries is around 300 times, with a maximum of 500 times, while lithium iron phosphate power batteries can achieve over 2,000 cycles. With standard charging (5-hour rate), they can reach 2,000 cycles. Lead-acid batteries of the same quality typically last "new for half a year, old for half a year, and maintained for another half a year," totaling about 1 to 1.5 years at most. In contrast, lithium iron phosphate batteries used under the same conditions have a theoretical lifespan of 7 to 8 years. Overall, the performance-to-price ratio is theoretically more than four times that of lead-acid batteries.

[Fitzgerald]

As a BYD Tang owner for several years, I believe battery replacement mainly depends on warranty and performance. BYD's battery warranty typically covers 8 years or 150,000 kilometers, whichever comes first. If the battery capacity drops below 70%, or if a dealership inspection reveals a range reduction exceeding 30% (for example, from the nominal 80 km to just over 50 km), it qualifies for free replacement. In practice, I've noticed signals like increased charging frequency or rapid winter power drain. I personally experienced this once when software diagnostics indicated low battery health, and the dealership replaced it after parameter testing. For daily maintenance, I recommend avoiding prolonged complete discharge or full charging, and using ECO mode appropriately can extend lifespan. Regular checkups are beneficial—cost-effective and safe.

[LeSebastian]

I have been working in the automotive repair industry for many years, frequently handling battery issues with the BYD Tang. Battery replacement conditions include warranty standards and fault indications. Within the warranty period, replacement is required if capacity tests show below 70% or if there are abnormal battery bulging or leakage issues. We typically use diagnostic tools to check battery health, and recommend replacement if voltage is unstable or charge/discharge data exceeds standards. A common scenario is vehicles used for five to six years showing significantly reduced range. In practice, BYD requires fault confirmation through authorized service centers. Battery lifespan is generally around 8 years, but this depends on driving habits—rapid acceleration and fast charging accelerate aging. The replacement process isn't overly complex, but original parts must be used to ensure compatibility. For similar issues, I recommend contacting a 4S store directly to avoid third-party risks.

[LeDakota]

Battery replacement for the BYD Tang largely depends on the warranty policy and the actual degradation level. The manufacturer offers an 8-year warranty, and if diagnostics show the capacity has degraded below 70%, a free replacement is provided. For example, my friend's car, after 6 years of use, saw its range drop from 80 km to 50 km, qualifying for a replacement. Frequent use of fast charging in daily use can accelerate aging. When replacement is needed, it's very convenient to just go to the 4S store to complete the procedures.