Just like regular bicycles, electric bikes can last for years with good care. The frames are normally very sturdy, and made of carbon, alloy, or aluminum, and are therefore very durable. In terms of a battery's lifetime, depending on how well you look after it, and how often you use the bike, you can expect between 2 and 4 years before you need to replace it. Keep in mind that you will also need to regularly service your bike with a professional, and store it out of the elements.