At 1:16 the battery finally attained 14.4V and the current had begun dropping.


If we assume that bulk was 100% efficient, and we will for round numbers, the energy returned to the battery at .2C during bulk charging looks like this:


21A X 1.27 Hours = 26.67 Ah


If we know the battery had 47.36 Ah left in it, at 49.5% SOC then:


47.36Ah + 26.67 Ah = 74.03 Ah stored in the battery


74.03 Ah as a % of 95.69 Ah (tested capacity) = 77.4% SOC


This battery, when charged at .2C from 49.5% SOC, stayed in BULK/CC for 1:16 minutes and entered ABSORPTION/CV charging, where current begins declining, at 77.4% SOC.


Once again this clearly shows how charge current affects the SOC transition point from bulk to absorption charging. At .4C the battery attained absorption voltage at approx 63.3% SOC and at a .2C charge rate it attained absorption voltage at approx 77.4% SOC.