I just got these a couple weeks ago. I charged them overnight and put one of them in my bathroom scale. It seems to be working great. I bought a wonderful little battery tester for about $7 at Harbor Freight and used it to test the other three. They are hot hot! Every one of them was bouncing off the end of the green when I tested them. I highly recommend getting a battery tester. I will know more after I use them in various gadgets but so far I really like them and I love the way they charge versus having a bulky charger plugged into the wall. I expected cord only have one plug and I would have to charge them one at a time so I think it's great that the cord can charge all four of them at once. If they end up not performing well after I've had them for a while I will update this but so far I'm very happy with the system.
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