The battery of electric bicycles plays a very important role, since it is responsible for supplying energy to the motor that will provide us with support during our ride.

Currently the vast majority of those that can be purchased are made of lithium due to its advantages. They are lighter in weight, can be recharged at any time without waiting for them to discharge, and last longer.

The capacity of the batteries is expressed in Watt hours (Wh), which is calculated by multiplying the Voltage (V) by the Ampere hours (Ah). There are batteries from 300 Wh to 700 Wh. The higher the number, the greater the autonomy, although this depends on other factors such as the efficiency of the motor, level of assistance, weight to be moved, etc.

In addition to the cells of which they are composed, the batteries have a very important component, the Battery Management System or BMS. This device is in charge of controlling many safety tasks such as preventing the battery from overcharging, overheating, correct charging and discharging, avoiding uneven degradation of the cells, etc.

Despite the BMS it is important to know that all batteries degrade with time and use. Time and use is given by the quality of the cells that integrate it. Manufacturers such as Bosch or Yamaha assure that their batteries are capable of withstanding 500 charge cycles with a degradation of less than 20%. This is equivalent to about 40,000 km of useful life.