I bought this a few months ago and they worked fine in the supplied Ultralast Charger for three times.After that. One battery died (voltage always 0.02) and the other stuck around 2.5V. I verified the charger was working, but the batteries were defective.Be warned that the company NAB refuses to even discuss this with me (it's only $10... jeez).Buy real lithium 123's for $1 instead of this garbage.DISAPPOINTED!