Exchanged by the dealer 3 of 5 from the start super, 2

Bought at KoKorest (RECOMMENDATION - short delivery time (2 days), since shipping from Europe & good service). Of the 5 pieces 3 were fine with flight times (over the Hubsan X4 H107C) of 6 minutes (without the camera was running). The other two seem to be faulty and keep only less than 2 minutes, one of which is thicker and wider than the others and does not fit into the battery compartment (taped for test flight under the copter).
Have contacted the dealer and will change depending on currently evaluating. If he converts, and now not be rapidly worse, then the price-performance ratio is the hammer - EDIT: he made without ceremony, had also not return at my expense or so.
The batteries have now become all 10+ charge cycles through and keep as good as the original.

PS: The charger may take up to 5 batteries simultaneously charge (naturally takes correspondingly longer), you just must not be irritated them that the LED begins to glow when no current is drawn (ie, when the batteries are fully or not infected is).