Disconnecting the battery will erase all the data from the vehicle's computer, which could make any problems with the car more difficult to diagnose in the future.
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It will also reset the electronic systems inside the car; if the car has an anti-theft radio system, for example, it will likely go into safe mode and will need a code to unlock it.
All radio station presets will also need to be reprogrammed.
If you're trying to turn the light off in hopes of passing an emissions test, this method rarely works. Even if all emissions data is cleared from the computer when the battery is disconnected, the car's systems need to complete a series of tests called a "drive cycle" before it can pass testing; sometimes more than one drive cycle is needed before the car is ready.