Answer: When you are sizing or selecting a proper battery for your system, i.e. energy storage system, electric vehicles, etc., you have to consider the factors mentioned below:

-The system voltage of the battery bank
-The power or current of the load (or the power of electric motor for electric vehicle)
-The working condition, i.e. working temperature, charging condition, etc.
-The required back-up time of the battery bank (or the maximum voyage and speed of the electric vehicle if the battery is used for electric vehicle)
-The maximum discharge power or current, as well as the time of at such maximum discharge power or current
-The required service life
-Other information required from the manufacturer