Most rechargeable batteries will only undergo a few hundred deep cycles to 20% of the battery charge. However, the exact number depends on the battery type, the details of the battery design, and how the battery is used. This is a significant figure in a battery specification, as it reflects in the lifetime of the battery, which in turn reflects in electric vehicles running costs. More specific information about this, and all the other battery parameters mentioned, are given in the sections that follow particular battery types.
It is adapted from the introduction of Electric Vehicle Technology Explained by James Larminie.