I noticed the same thing as I routinely cycled four packs of the latest IB batch with 30A DX that brought their temps up to 170F. I use a Futaba CDR-5000 charger and the voltage and runtimes have been very consistent. I did have some decent results with step charging them @7A till 3050mA @.5A till 3080mA and finally @6.5A till they reached a 5mV/cell delta peak. Three out of four packs increased their runtime by an average of 10s and the voltage increased throughout the entire discharge, but I don't remember how much. The fourth pack increased its voltage, but lost 4s of runtime.
I'll fire up the charger, do a few cycles and provide some pics of the charging results.
Of course I don't have any 3700's to compare results with though.
