The problem was only seen in the SANYO 2500mah, the sanyo 2100 n 2300 were ok.
Probably due to this strain in customers' confidence, some retailers have switched to selling the powerex instead. For now, both the powerex 2500 n 2700 have no known problems.
To TS, the difference between the 2500 and 2700 is only a few dollars, bout 5 at most (for a set of 4), if ur not on a tight budget, might as well get the higher capacity ones. Afterall you dont know when you might actually run out of juice..