I'm not real savvy about the power situation for the Sprint Hero that I just bought. The OEM power source says that the input is standard 100-240V. The OEM output shows as 5V=1A. Now, I have other USB chargers (e.g., for my iPod). The input is the same (100-240V), but the output is: Output: 5.0V=400mA Can anyone tell me (a) whether this will HARM my Hero, and (b) whether this will effectively CHARGE my Hero? ALSO: Connecting to my computer via the USB cable: does the charge take longer than if connected directly to a wall charger? Thanks for any guidance.