Hello mOJAVE,
The charger linked will charge to ~4.20V in theory (assuming specifications are correct). The only type of li-ion cells that should theoretically be charged with this type of charger would be 3.7V LiCo (ICR) and LiMn (IMR) type cells (or some LiPo cells using an adapter or fixture of sorts). There aren't any 3V rated cells that will be properly charged in that charger.
Actually, given the track record of cheap chinese chargers, there probably aren't any cells from any manufacture of any chemistry that are likely to be charged CORRECTLY in that charger...
For the sake of revealing all; LiFePO4 is a very tolerant and stable chemistry when compared to most other lithium chemistry cells. Some experimentation by other people on forums seems to suggest that this type of cell may tolerate overcharge reasonably well. There are some people out there that have charged LiFePO4 cells to 4.2V without any significant consequence that was apparent at the time. Ideally speaking, it's best to terminate the charge of this chemistry in the 3.6-3.8V range. Over the long haul, it should be assumed that overcharging repeatedly would result in significant loss of cycle life and an increase in the risk of cell instability.
Have you thought about just getting some 3.7V cells, and using an even higher resistance atty? Moving up into the 4+ Ohm range would line up with a pair of 3.7V cells without TOO much trouble in most circumstances.
Eric
