I don't recall what light these came with but they're 3-4 years old. Suspect battery on the right has no expiration date, the wrapper is upside down (+ and - reversed) and tests at 3.08V (60% on MBT-1) despite being unused, vs 3.26V on the left. They weigh the same, 17-18g.
Seems an odd thing to counterfeit. Just crappy quality control? Anyone else have batteries like the one on the right?