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The below 20% is a complete load of bollocks. It is actually A Good Thing (tm) to completely discharge your battery every 2 weeks or so and then recharge fully before use to extend the lifespan of the battery.
Additionally, All the major laptop manufacturers that the company I work for service (Toshiba, Compaq, Acer and NEC) require us to recycle the battery 4-5 times before we are able to change the battery due to poor life span as most of the time the battery has been left on trickle charge its entire life not allowing the cells to function properly and the BMU board gets faulty battery information and reports it back to the BIOS that the battery is flat.
In fact, if you have a Sharp laptop you are able to go to www.sharp-service.net and download a battery refreshing program that bypasses all the windows power management. NEC and other manufacturers tend to have a battery refresh program as a BIOS utility.