Addendum:
After more than one year use and over 400 charge cycles per cell (each 4,1-3,5V) and a charging current of 0.5A 50% and 50% 1A; Discharge approximately 2.5A blesses the first set of batteries slowly the temporal. The capacity is now back significantly.
At this load which is quite a good performance and there has never been a failure.
Conclusion: to be good and will order again. The price is absolutely justified.