Charging, but still not

I just got my Pulse 2 yesterday, and I really enjoyed it. While it lasted. Now I can't charge it. I plug the cable in and I see the first little lamp start flashing white, which I thought was it charging (and I'm guessing it is), but I left it to charge over night, and when I came to take a look at it, it was still at the same charge. Have I done something wrong? I tried using the charger on my phone, and it worked flawlesly. (Although, I didn't use the actual USB cable, because I don't have a phone which uses this type of cable, only the dongle that you put in the wall) Any help would be appreciated.