That could be the difference mine is the original version. Most of my packs are 1500 mAh so C/10 is 150 mA.
I cannot get my older version to charge at 150 mA for 16 hours.

I've re-read my posts and I come off sounding like I have all the answers. I appologize about that as it was not my intention.
I do have a lot of experience with packs and have some that are 5 years old that still check to within 85% of their original capacity.

I am replacing a lot of packs this year even though the packs test good. They are just getting to old for my peace of mind.
John