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No, it's not legal. You have the right to return it within the timeframe (usually 7 days on Shopee) even if you open the packaging, as long as the product is in resalable condition and you can prove a factory defect like a bad battery. Opening it to inspect is totally normal and doesn't void your right - that's consumer protection.

Consumer law makes it clear that you can return it even if you open the box - what matters is that the defect is real and provable. Take photos of the faulty battery, document everything, and send it to Shopee requesting a return due to product defect, citing the Consumer Protection Code. If the store keeps refusing, you escalate directly to Shopee (the platform usually steps in for these situations) or go to Procon if nothing gets resolved.

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