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Concentrations and Credit Risk (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Sales of finished goods and raw materials |  | $ 37,566,152 |  | $ 22,194,348 |
Zhengzhou BAK Battery Co Ltd [Member] |  |  |  |  |
Sales of finished goods and raw materials | [1] | $ 12,770,075 |  | $ 3,961,050 |
Concentration risk, percentage | [1] | 33.99% |  | 17.85% |
Customer A [Member] |  |  |  |  |
Sales of finished goods and raw materials |  | $ 8,322,504 |  | $ 7,222,245 |
Concentration risk, percentage |  | 22.15% |  | 32.54% |
Customer B [Member] |  |  |  |  |
Sales of finished goods and raw materials | [2] | $ 3,806,110 |  |  |
Concentration risk, percentage |  | 10.13% |  |  | [2]
Customer C [Member] |  |  |  |  |
Sales of finished goods and raw materials | [2] |  |  | $ 3,308,638 |
Concentration risk, percentage |  |  | [2] | 14.91% |
[1] | Mr. Xiangqian Li, the Company's former CEO, is a director of Zhengzhou BAK Battery Co., Ltd. Up to the date of this report, Zhengzhou BAK Battery Co., Ltd. repaid $7,691,611 to the Company.
[2] | Comprised less than 10% of net revenue for the respective period.

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