I bought a pair of solarforce protected 3.7v RCR123a batteries from ebay and received them today. I tried them in my new Quark mini 123 flashlight. One battery works fine. The other one only works 0.1 second then the light goes off, what i means is that when I turned on the flashlight, there is a blink of light, then the light gradually goes off. At first, I thought I may need to charge the battery. So, I tried to put the battery into my DSD charger and then plugged in (I got the DSD charger from DX and it's the first time for me to use it, i followed the instruction of "plugging in after inserting battery" that i read somewhere from this forum). The indicator light turns solid green, but with casual blink of red, that is, there is a blink of red for around every 15-20 seconds. I am not sure whether it is charging or not. Anyway, after around 10 minutes, I get the battery out and then try it again in the flashlight, the problem still exists: there is only a blink of light, then the light gradually goes off. I really don't know what's going wrong here. Is the battery defective or does the charger have problem? Does anybody have any idea about the possible reasons? Thanks for help!