Friday 14 August 2009

Parameters for Battery Performance

No one battery design is perfect for every application. Choosing one requires compromise. That's why it's important to prioritize your list of requirements. Decide which ones you absolutely must have and which you can compromise on. Here are some of the parameters to consider:

Voltage
Normal voltage during discharge, maximum and minimum permissible voltages, discharge curve profile

Duty cycle
Conditions the battery experiences during use. Type of discharge and current drain, e.g., continuous, intermittent, continuous with pulses, etc.

Temperature
In storage and in use, temperatures that are too high or too low can greatly reduce battery capacity.

Shelf life
How rapidly the cell loses potential while unused.

Service life
Defined either in calendar time or, for secondary cells, possible number of discharge/charge cycles, depending on the battery application. Service life depends on battery design and operational conditions, i.e., the stress put on a battery. For stationary and motive power application, the end of service life is defined as the point at which a battery's capacity drops to 80% of its original capacity. Exceptions would include car batteries where the service life ends when the capacity falls below 60%.

Internal resistance
Batteries capable of a high-rate discharge must have a low internal resistance.


2 comments:

  1. Really useful post but another point keep your batteries clean - It's a good idea to clean dirty battery contacts with a cotton swab and alcohol. This helps maintain a good connection between the battery and your portable device

    Regards
    Power Protection

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