When will the color of the  battery icon  in the top bar will become red?

What is the percentage of battery life at which the color of the  battery icon  in the top bar will become red? 20% or 10%?

it is not a good idea to drain you macbook all the way down to see when it turns red.  if it ever does - i've never seen mine red when it's down to 10%.
if you follow some of the threads here - some people who drained their battery all the way down to 0% can't turn their macbook back on.
From Apple's website:
Standard Maintenance
For proper maintenance of a lithium-based battery, it’s important to keep the electrons in it moving occasionally. Apple does not recommend leaving your portable plugged in all the time. An ideal use would be a commuter who uses her notebook on the train, then plugs it in at the office to charge. This keeps the battery juices flowing. If on the other hand, you use a desktop computer at work, and save a notebook for infrequent travel, Apple recommends charging and discharging its battery at least once per month. Need a reminder? Add an event to your desktop’s iCal. When your battery no longer holds sufficient charge to meet your needs, you may choose to replace it. If your notebook came with a built-in battery, you should have the battery replaced only by an Apple Authorized Service Provider.

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