I have a number of Eneloop packs. I can't remember if I had any issues, but I had decided long ago to move on from the Nimh chemistry. I have been very happy with my A123's, but was looking for something smaller for a .15-.25 sized plane. The size I wanted has been out of stock everywhere, so I went with 1000 mah, Turnigy 6.6 volt Life packs from Hobby king. They were like $5, and still very small for the amount of capacity.