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Choosing well its bike to electric assist (VAE) battery

Published on 04/21/2014

The principle of the electric bike is to provide assistance with the pedal to the user. The battery of the EAB sends its energy to the engine to amplify the movement of the pedal.


Different types of batteries:

The battery is characterized by its voltage in Volts (V) and its capacity in amp hour (Ah). On a battery of VAE, the voltage (V) responds to an impression of power and capacity (Ah) corresponds to autonomy.

By comparison, the battery voltage is equivalent number of horses of a car and capacity corresponds to the volume of the tank.





  • Attractive price
  • No memory effect
  • Weight (approximately 10KG)
  • Do not fully discharge
  • Reload at least 1 time/quarter
  • Self-discharge (1%/jour)


  • Weight (4-6KG)
  • Can be stored unloaded
  • Memory effect (discharging the battery completely in order to recharge it


  • Weight (2 to 3KG)
  • Great power
  • No memory effect
  • Self-discharge (5%/mois)
  • High price

Precautions to be taken to prolong the battery life:

  • Use a suitable charger, at the risk of damaging your battery
  • In the event of prolonged immobilization, load it before it is stored
  • After a refill, if si possible can wait an hour before using your bike
  • After use, leave the battery at least an hour before recharging
  • Store your battery in a dry place with a temperature between 10 ° c and 20 ° C away from a direct heat source

Estimated battery life:

  • Lead: 300-400 cycles *; either 3/4 yrs
  • NICD/NIMH: 500 cycles *; either 4/5ans
  • Lithium: 600 to 1300 cycles *; 6/10 years

* A cycle corresponds to a load and discharge the battery.

Estimate of your battery:

Autonomy depends on several factors:

  • The type of road and weather conditions
  • The corpulence of the user and its loading
  • The effort by the user
  • Type of tyres
  • The battery (capacity, wear it)
  • Engine power

To quickly calculate your battery (for a user to Middleweight and in normal weather conditions), do the following calculation: *.

Autonomy = capacity (ampere-hours) x voltage (Volts) / power (Watts)

Example: for a battery 36 Volt 10Ah and a 200-watt motor. This gives:

36 X 10 = 360

360/200 = 1 hour and 48 minutes at full power.

* These values are as purely indicative. These can be doubled if you pedal often or divided by two if you do not ride.

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