| Schedule of prepayments, net |
| | | | | | | | | As of December 31, | | | 2025 | | 2024 | Prepayment for R&D | | $ | 11,799,310 | | $ | 13,296,763 | Prepayment for purchase of property and equipment | | | 1,393,678 | | | 1,378,198 | Prepayment for purchase of materials and others | | | 3,863,436 | | | 3,305,963 | Prepaid expense for others | | | 606,259 | | | 319,196 | Subtotal | | | 17,662,683 | | | 18,300,120 | Less: impairment loss | | | (4,204) | | | (4,867) | Subtotal, net | | | 17,658,479 | | | 18,295,253 | Less: Long term portion | | | (7,113,014) | | | (8,021,046) | Prepayments, net – current portion | | $ | 10,545,465 | | $ | 10,274,207 |
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| Schedule of prepayments impairment loss |
| | | | | | | | | | | | For the years ended | | | December 31, | | | 2025 | | 2024 | | 2023 | Balance at the beginning of the year | | $ | (4,867) | | $ | (5,002) | | $ | — | Additions charged to the impairment loss | | | — | | | — | | | (5,016) | Foreign currency translation adjustments | | | 663 | | | 135 | | | 14 | Balance at the end of the year | | $ | (4,204) | | $ | (4,867) | | $ | (5,002) |
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