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. Having been tested multiple times, it has an increased tightness
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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. It is highly resistant to acid, alkali, and other chemical substances
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Douai undergoes the following production processes: the preparation of metal materials, cutting, welding, surface treatment, drying, and spraying. Made of standardized materials, it has the performance of high- and low-temperature resistance
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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). It is less likely to leave dents on the product
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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. Having been exquisitely ground and polished, it looks great in its appearance
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It has a complete life cycle and high performance. It has served over 2600 customers since its launch