Hi, I bought an used Forerunner 910xt, It came without charge, I used Forerunner 301 charger (5v 0,5A and the 910xt charger is 5v 1A) for changing, I charged the 910xt to 30% then unpluged and tried and worked, But I charged the 910xt to 100% and now Is Not Powering, when I connect charger show in display "Charging -1%, can I charge the 910xt with PC usb Port? Please what can I do?