How can I convert Reserve Capacity to amp hours at a 25-amp discharge rate?

To convert BCI Reserve Capacity at 25 Amps to equivalent Ampere-Hours at the 25 amp per hour rate, multiply RC by .4167. More ampere-hours (or RC) are better in every case when looking for a deep-cycle battery. This conversion method will allow you to convert and compare competitive data GENERALLY.

180RC x .4167 = 75Ah at the 25A rate.