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Concentrations and Credit Risk (Details 1) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts receivable |  | $ 16,654,801 | $ 21,751,032 |
Zhengzhou BAK Battery Co., Ltd [Member] |  |  |  |
Accounts receivable |  | $ 2,113,251 |  | [1]
Concentration risk, percentage of accounts receivable |  | 12.69% |  | [1]
Customer A [Member] |  |  |  |
Accounts receivable |  | $ 1,524,997 | $ 1,769,416 |
Concentration risk, percentage of accounts receivable |  | 12.05% | 11.49% |
Customer C [Member] |  |  |  |
Accounts receivable |  | $ 2,206,467 | $ 2,293,257 |
Concentration risk, percentage of accounts receivable |  | 17.38% | 14.89% |
Customer E [Member] |  |  |  |
Accounts receivable | [1] |  | $ 4,283,023 |
Concentration risk, percentage of accounts receivable | [1] |  | 27.82% |
[1] | Comprised less than 10% of account receivable (net) for the respective period.

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