When batteries are used in series, if the internal resistance of the batteries is not consistent, the terminal voltage of the batteries during charging and discharging will be inconsistent, which will eventually cause premature failure due to undercharging of the entire battery pack. In electric bicycles, therefore, the balanced consistency of the battery pack has a considerable impact on the life of the battery. For the consumer, how it is used rationally can also have an impact on the balanced consistency of the battery, and thus on its service life. Based on years of research and practical use of batteries, the following methods are recommended for consumers to use batteries in a reasonable manner.

(1) Electric vehicle riding speed: 20-25km/h.

(2) Riding distance: 10-30km/day, depth of discharge less than or equal to 70% (deep discharge once every 2 months).

(3) Charging frequency: once a day.