Just got my Lumia 820. After the battery got full discharged I tried and charged it. Also it went "goodbye" on me for at least 4 times while plugged in my laptop. Stupid me didn't see I got a UK charger. And I don't have a adaptor atm. Well I wanna ask does it really take around 5-6 hrs of full charge? From 0% to 100%? Or it only took that long cause It was plugged in my laptop?