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To convert Reserve Capacity (RC) to Amp Hours (AH) you must first figure out the total Coulombs (C). To better understand the "how and why" follow the steps below.
NOTE: this number should be used more or less as an estimate and not used as an exact science as each battery brand will have different resistance levels, metal alloys and production quality that will skew certain metrics in favor of a desired outcome.
If you are in a hurry and don't care about the steps simply multiply the RC by 0.4167. If you are in a bigger hurry and want a guesstimate divide the RC by 2. The actual battery AH should fall somewhere in between these two numbers
Look at the Drakon Group 24 battery, for example, it lists the RC at 160 and the AH at 76 vs. our calculation of 66.67AH using the multiply by 0.417 method and 80AH using the divide by 2 method.
Reserve Capacity (RC) indicates the amount of time a fully charged lead acid battery discharged at 25 amps will last before falling below 10.5 volts. In a perfect world this test is measured at 80F or 26.7C.
Odyssey and NorthStar Battery are great examples of a dual purpose AGM battery with a high Reserve Capacity.