For the Years Ended December 31,

2023

2024

2025

US$

Issuance of loans to Beijing Puyan

(i)

—

1,404

—

Proceeds from repayment of loans to Beijing Puyan

(i)

2,886,378

54,762

—

Interest income from Beijing Puyan

(i)

6,709

1,571

31,450

Payment of interest free advance to Mr. Ding Rui

(ii)

270,823

—

—

Proceeds from collection of the advance to Mr. Ding Rui

(ii)

244,092

270,001

—

Purchase of materials from Shenzhen Zhichong

(iii)

70,698

428,046

147,611

Sell products to Shenzhen Zhichong

(iii)

—

—

10,407

Sell products to Zhichong New Energy

(iv)

406,373

1,690,196

743,420

Issuance of loans to Zhichong New Energy

(v)

94,738

—

—

Proceeds from repayment of loans to Zhichong New Energy

(v)

—

25,071

—

Interest free advances to two executive officers

(vi)

27,483

—

—

Proceeds from collection of advances to the two executive officers

(vi)

27,483

—

—

Interest free advance to Mr. Hou Yifei

(vii)

406,237

—

—

Proceeds from collection of the advance to Mr. Hou Yifei

(vii)

—

405,938

—