I'm not sure if there is a calculation the charger makes based on voltage, or if there is a power curve (not a battery expert here) but if there is a power curve, that would make it exponentially harder to calculate the mah remaining in a battery.Charging my LG HG2's (3000mah rating) that are drained to 3.2v gives me a 2775 MAH value when the cells reach full charge. so, I agree that most of the power curve must be exhausted by the time 2.8v is reached and there's a rapid decline in power from 3.2v.