On local listings is full of garbage Ultrafire packs with free chargers for many flashlights sold. Everyone likes them and if you tell them they are truly garbage from all points of view, built-in safety, capacity, and garbage overcharging chargers no one cares because they say: "they are cheap, they are good enough for amateur usage"
Li-ion safety should not be taken in terms of amateur-usage or cheap-enough for just playing around!
A very informative thread about thread about cheap cells.