Douai is manufactured by means of both machines and manual labor. Especially some detailed and sophisticated parts or workmanship, are manually finished by our professional workers who have years of experience in handmade crafts. Its materials decide its excellent rain and dust resistance
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Before production, the electrode materials of Douai are carefully handled to prevent them from coming into contact with each other. Because contamination between the anode and cathode materials will ruin the battery. The product itself has a heat-resisting property
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Douai undergoes the following production processes: the preparation of metal materials, cutting, welding, surface treatment, drying, and spraying. Having been exquisitely ground and polished, it looks great in its appearance
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Douai is strictly inspected during production. It is checked on its appearance (porosity, scratches, dents or holes, paint runs, blisters, debris contamination). The product has the advantages of heavy tension and impact resistance
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The design of Douai is based on the combined theories of the law of seals and the principles of applied science. It is widely used in oil, transportation, auto, and other industries
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It has a complete life cycle and high performance. The product is sealed and welded exquisitely