Sellers like that scare me. What we need, are more sellers who do a better job of labeling cells and chargers, or at least providing good information about the cells and charger they are selling, so that confusions such as this don't crop up. It's strange that in the li-ion world, the 3.6V and 3.7V rating is kind of used interchangeably, even though at 3.6V open circuit, the cell is almost dead, lol.
What we need is some standardized system. Classes of li-ion chargers and cells sold with some kind of marking that identifies what they are compatible with..... I think I might bring this up in another thread.