HP Tc4400 Power - Page 34

Battery packs When the computer cannot restore from hibernation To resolve a low-battery condition when the computer lacks the power to restore from hibernation: 1. Insert a charged battery pack or plug the computer into external power. 2. Restore from hibernation by sliding the power switch toward the front of the computer. Calibrating a battery pack When to calibrate Even if a battery pack is heavily used, it should not be necessary to calibrate it more than once a month. It is not necessary to calibrate a new battery pack before first use. Calibrate the battery pack under the following conditions: ■ When battery charge displays seem inaccurate ■ When you observe a significant change in battery run time ■ When the battery pack has been unused for one month or more How to calibrate Three steps are involved in calibrating a battery pack: fully charging, fully discharging, and then fully recharging. Power 7-11