When the battery is used in series, if the internal resistance of the battery is inconsistent, the battery terminal voltage during charging and discharging will be inconsistent, which will eventually cause the entire battery to be undercharged and prematurely fail. Therefore, in an electric bicycle, the uniformity of the battery pack has a considerable influence on the service life of the battery. For consumers, how to use it reasonably will also have a certain impact on the balance of the battery, thus affecting the service life of the battery. According to the research and practical use of the battery for many years, it is recommended that consumers use the following methods to use the battery rationally. (1) Riding speed of electric vehicles: 20-25km/h. (2) Riding distance: 10-30km/day, discharge less than or equal to 70% (every 2 months deep discharge). (3) Charging frequency: once a day. (4) Carriage: One person rides (one child under the age of 10 can be carried). According to the above method, the better quality electric bicycle can reach normal use for 3-4 years, even 5 years, and the battery can use for about 1 year and a half. The shallower the battery discharge depth, the longer the cycle life of the battery and the longer the battery life cycle. Therefore, consumers generally believe that the idea of charging a battery for one cycle is wrong. To extend the battery life of your battery, you must always make the battery fully charged. Under a long-term depletion condition, the battery’s negative plate It is extremely salty, causing a loss of battery capacity and affecting the life of the battery.