How long was "a while"? For me it was 10 minutes. It's still charging.... three hours now.
Yours seems to work the opposite way than mine. Perhaps something to do with charging calibrations of the charging-electronic? When I got mine (last thursday), I was completely discharging/charging 2-3 cycles., so the electronic could calibrate to the battery. But I used the device when charging the first times, perhaps that was not optimal?