Kettles generally do this, Here's why: As it's heating up, the water next to the element turns to gas and starts to rise to the top. Since the gas bubbles are small at first, they turn back to water before reaching the surface and water rushes in to fill the space - this is what creates the noise. When the element gets quite hot, however, it can convert the water to gas more quickly which creates bigger bubbles that float to the top and burst into the air.
So, the longer it takes to heat up, the longer it makes noise. Some kettles have a more powerful element that simply gets to the second stage more quickly. The 'cordless' ones like yours have a smaller connection from the power to the element and it takes a bit longer. Worthwile, considering the convenience, in my opinion.
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