My 510 usb chargers worked fine on my computer with my ego batteries but I bought a usb ego charger that frequently the led wouldn't turn red to indicate charging without fiddling with the battery a good bit. I thought I just had a bad one. They are cheap enough that I just ordered another. When I got it, it had the same problem but even worse. When I tried plugging them into a usb hub with it's own power supply they both worked fine. The problem was with my pc. So much to learn...
