Because the regular battery is in about 8 months to carry out the first maintenance, this can effectively extend the battery life.
Generally speaking, the first maintenance 8-10 months, the second around 15 months. Many electric bicycles only pay attention to the battery, but ignore the charger, in fact, the charger may not be good to charge.
Electronic products generally aging after several years of use, chargers are no exception. If you have a problem with your charger, it can cause an electric bikes battery to be undercharged or overcharged. It also affects battery life.