Battery life is calculated in charge cycles. This means it depends on the number of full charges (from 0 to 100%) that they can undergo before their effectiveness gradually diminishes, until they no longer function at all.
In theory, an electric bicycle battery can undergo several hundred charge cycles. How much exactly? That depends on the battery type concerned. The way you take care of your battery will also affect its life. For example, if you store your battery somewhere dry and protected from temperature fluctuations, you will keep it longer. In general, with regular use, an electric bike battery becomes less efficient after 3 to 5 years.
E-bike battery life expectancy is mainly determined by the battery type. The most commonly used batteries are:
Be careful! This lifetime is a theoretical indication based on manufacturers' estimates.
Make sure the seller has a minimum two-year guarantee, as established by law. Also be aware of the 'health' of your battery. If you notice that it discharges more quickly after a few months, there is probably a manufacturing defect.
The maximum number of charge cycles specified by the manufacturer in fact corresponds to the number of recharging cycles that a battery can theoretically undergo without losing too much efficiency.
At the end of the specified number of cycles, its performance will be reduced and it will hold its charge for a shorter time. It is up to you to judge, depending on your use, whether a replacement is necessary or whether you can get by.
The energy it has stored escapes gradually: this is called 'self-discharging'. If it remains completely discharged for a long period of time, irreparable damage can occur due to chemical reactions inside the battery. Refer to your battery's user manual for information on what to do if you do not intend to use it for a period of time. Recommendations vary depending on the type of battery.
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