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请根据下面表格中的信息写一篇130词左右的说明文，介绍电动自行车这一新型交通工具。

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产品项目描述电动自行车外观是一种加装了电池电机来帮助驱动的自行车，有的还装了脚蹬子，可骑行。速度时速最高达15—20公里，安全可靠优点价格适中，轻巧便利，低噪音，环保节能，颇受城镇消费者青睐。存在的问题一般充电300—400次后，电池得更换。废电池回收不及时将造成二次污染。

An electric bike is a bike with an added battery—powered electric motor. Some kinds are with pedals so that people can ride when necessary. The highest speed of it is 15 to 20 kilometres per hour.

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It is safe for people to ride it when they go to work, and the price is not very high. What’s more, they are friendly to the environment as they save energy and make low noise.

Also , there are manyproblems with them. For example, the batteries must be replacedafter having been used for 300 to 400 times. If they are not changed in time, they would cause pollution again.