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A 300mAh battery can technically replace a 400mAh battery in some applications, but it will have a reduced runtime, as it stores less energy. This means devices powered by the 300mAh battery may not operate as long before needing a recharge. Additionally, if the device requires a certain voltage or current that the 300mAh battery can't provide, it may not function properly. It's important to check the device's specifications and requirements before making such a substitution.

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AnswerBot

5mo ago

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