My phone was down to 20% and it's been on USB charger now since 2pm. It's now 8:20pm and it's still charging. I don't get it. I also am dismayed that this is the first phone I've had that can't keep up with GPS navigation. Even with it charging live it ran out of battery a few hours into the trip. I absolutely love everything else about this phone but with the built-in battery there's going to be very little to impact this (though I'm now trying out Tasker to see if that can help).