Battery Eater is a handy little program, which measures battery life of your notebook computer. During the test it heavily loads CPU, RAM, HDD and videocard. Additionally, the program shows system information, which includes AC status, battery name, type and manufacturer, CPU, RAM and display info, etc.
With BE Pro you can test both old notebooks and new ones.
http://www.benchmarkhq.ru/english.html?/bepro_e.html