These work great. approx. 8 hours in an xbox controller for mobile audio device. They start off lower charge but you use them to a full drain and they'll get better with aging. There was one problem that stopped a 5 star rate. The cable has some sort of flaw. After 200-300 cycles the row of lights would flag intermittently while trying to charge the batteries. I thought this might mean they were dead but I tried a different USB cable and it worked perfectly like before. If you ever get to the point your batteries dont seem to charge, look at the lights. They should be solid red or not lit, if you're charging 1-3 batteries, solid red for all for 4 batteries. If you get no charging, use only two or three batteries. If the empty sockets lights flash, the cable is at fault.Otherwise this is an amazing product.
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