Is it just me or the HTC Butterfly takes a very long time to full charge? When I am using the HTC supplied AC adapter (1A output), it takes like 5-6 hours from zero to full. I tried using the Samsung 2A AC adapter and it took like 3 hours or so. My HTC 8X takes only like 3 hours on the 1A AC adapter, but they have almost the same battery capacity.