In the read mode (auto scrolling in Haali Reader, the lowest backlight level and the lowest clock rate) the A636 lasted for 35 hours 50 minutes on a single charge. The MP3 playback from the memory card with the screen of drained the device completely out within 23 hours 24 minutes. Under the maximum load Asus A636 worked for 4 hours 10 minutes. In GPS navigation mode with 50% backlight level the device was good for 7 hours 10 minutes. Bravo Asus! Hats off! The PDA outpaced all previous records. And don’t forget that the A636 is equipped with Intel XScale processor and not the efficient TI, and the battery capacity is far from 3600 mAh. We suppose, this record will be kept for a long time, this model should become the standard to access offline work. Other manufacturers should think about power consumption optimization for Intel XScale processor.