| Schedule of accrued warranty activity |
| | | | | | | For the Year Ended December 31, | | | 2023 | | 2024 | Accrued warranty at beginning of the year | | 1,594,312 | | 3,251,112 | Warranty cost incurred | | (127,901) | | (289,592) | Provision for warranty | | 2,268,650 | | 2,198,267 | Adjustments to pre-existing warranty liabilities(1) | | (483,949) | | — | Accrued warranty at end of the year | | 3,251,112 | | 5,159,787 | Including: Accrued warranty, current | | 236,699 | | 518,441 | Accrued warranty, non-current | | 3,014,413 | | 4,641,346 |
(1)The Group periodically revisits historic warranty cost incurred and updates estimates of costs of future claims using this information. In this regard, the Group reversed the pre-existing warranty liabilities of RMB483,949 and nil for the years ended December 31, 2023 and 2024, respectively.
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