Why Does 4C Equate to 400 Amps in This Context?

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Discussion Overview

The discussion revolves around the interpretation of the term "4C" in the context of battery ratings, specifically addressing how it relates to current in amperes. Participants explore the meaning of "C" and its implications for battery capacity and discharge rates.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants assert that "C" in the context of battery ratings refers to battery capacity, where "1C" is equivalent to the amp-hour rating of the battery.
  • Others propose that "4C" indicates a discharge rate of 400A for a duration of 1/4 hour, contingent on understanding the battery's discharge curve.
  • One participant suggests that "C" could be interpreted as Roman numerals, equating "4C" to 400, although this interpretation is challenged.
  • There is acknowledgment that the term "C" does not refer to coulombs in this context, which some participants initially assumed.

Areas of Agreement / Disagreement

Participants express differing views on the meaning of "C" and its implications for battery ratings. There is no consensus on the interpretation, and multiple competing views remain present.

Contextual Notes

The discussion highlights the need for clarity regarding the definitions and assumptions related to battery capacity and discharge rates, as well as the non-linear nature of battery discharge curves.

robinfisichel
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http://evcomponents.com/cscart/index.php?dispatch=products.view&product_id=29862

for example

I thought Coulombs SI units was A.s so for 1 second 4C = 4A, am i wrong?
 
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robinfisichel said:
http://evcomponents.com/cscart/index.php?dispatch=products.view&product_id=29862

for example

I thought Coulombs SI units was A.s so for 1 second 4C = 4A, am i wrong?

The C is probably for Roman Numerals...which means 100. Hence, 4C = 4 x 100 = 400, 12C = 12 x 100 = 1200.

CS
 
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No the 'C' in the battery rating refers to battery capacity. '1C' is synonymous with the 'amp-hour' rating of the battery, and is the the rate at which the battery totally discharges in something a little less than one hour. For the OP's example, 4C=400A means the battery would supply 400A for 1/4 hour, but one needs to see the battery discharge curve for tje exact meaning as the curves are not linear.

http://www.batteryuniversity.com/partone-16a.htm
 
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mheslep said:
No the 'C' in the battery rating refers to battery capacity. '1C' is synonymous with the 'amp-hour' rating of the battery, and is the the rate at which the battery totally discharges in something a little less than one hour. For the OP's example, 4C=400A means the battery would supply 400A for 1/4 hour, but one needs to see the battery discharge curve for tje exact meaning as the curves are not linear.

http://www.batteryuniversity.com/partone-16a.htm

Thanks mshelp! You seem to be answering a lot of my questions lately! I am not sure i completely understand but I get the idea now, C is NOT coulombs!
 
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