In 2013 I got 8 pieces of these generic protected 2600 FMs for my Skyray Kings. Yesterday I put one set of four pieces in my brand new Thrunite Mini TN30 with 4S battery configuration. They were fully charged when I went for an hour and a half walk. The next day, I checked the voltage of the cells to see what kind of deviation I have with these four year old cells with about 50 charge/discharge cycles. All four cells had the exact same value of 3.802 Volt. It’s so unrealistic cool… This gave me so much confidence in Sanyo. 
(I’m waiting for my Enerpower 3500 GAs to arrive for my Mini TN30)