What Is 0.5C in Lead-acid Battery Parameters?

In the context of lead-acid batteries, “0.5C” refers to a discharge or charge rate that is half of the battery’s capacity per hour. The term “C-rate” is used to describe the rate at which a battery is charged or discharged relative to its nominal capacity.

To understand 0.5C more clearly, let’s break it down with an example:

  1. Battery Capacity: Suppose you have a lead-acid battery with a nominal capacity of 100 ampere-hours (Ah).
  2. 0.5C Discharge Rate:
    • A 0.5C discharge rate means the battery is discharged at a rate equal to half its capacity per hour.
    • For a 100Ah battery, this would be 0.5 * 100Ah = 50A.
    • Therefore, discharging the battery at 0.5C would mean drawing 50 amperes from the battery.
  3. Discharge Time:
    • At a 0.5C discharge rate, the battery would theoretically take 2 hours to be fully discharged.
    • This is because 100Ah / 50A = 2 hours.
  4. 0.5C Charge Rate:
    • Similarly, a 0.5C charge rate means charging the battery at a rate of 50A.
    • If you charge a 100Ah battery at 50A, it would theoretically take 2 hours to fully charge the battery, assuming 100% charging efficiency and no losses.

In summary, “0.5C” in lead-acid battery parameters indicates that the battery is being charged or discharged at a rate that would fully charge or discharge the battery in 2 hours if the process were perfectly efficient. This C-rate is crucial for understanding the performance, efficiency, and safe operating limits of the battery.


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