Someone should reply with a link, but in the meantime, here are the highlights:
"SOH" stands for "State of Health" and refers to remaining battery capacity. A SOH of 88, for example, means about 88% of the original capacity is left.
"Cell differential" refers to the difference, in millivolts, between the highest battery cell voltage and the lowest. While the number changes at different states of charge (SOC), you want this number to be as low as possible, especially when the SOC isn't extremely low. So 45mv at 50% charge is good, while 150mv is NOT. It indicates possible weak or bad cells.
"Histogram" is a chart that shows the voltages of all the cell pairs in the battery. when all of the vertical graph lines end close to each other, you generally have a good battery. When one or more of them end MUCH lower in the graph - accompanied by correspondingly low cell differentials - you quite possibly have a problem. What ISN'T a problem, though, is lots of red graph lines, as that just shows which cells are currently charging.
Gotta go now.
