Hitachi GD8000 User Guide - Page 33

GD8000 User Guide Operating with Battery Power When to Replace the Battery Over time, the battery's capacity gradually decreases. We recommend that you replace your battery if it no longer provides 70% of its original rated capacity. WARNING Only use approved batteries when replacing the battery. To Install the Battery: 1. Turn the computer over so you are looking at the bottom. 2. Line up the battery connector. 3. Press gently on the battery until it clicks into place. NOTE When using a battery pack for the first time, it is recommended that you calibrate the battery so the gas gauge accurately displays battery capacity. Battery Charging To charge the battery, install the battery pack and plug the AC adapter into the computer and an electrical outlet. You can use your computer while charging the battery. However, this will increase the charging time. While the battery is charging, the Battery Power LED will be active after 6-12 seconds and stay lit until the battery is fully charged. When the battery is fully charged, the LED turns off. If your computer is off or suspended, a fully discharged battery takes about 4 hours to recharge. If your computer is turned on it may take four to six (4- 6) hours to recharge the battery. System On System Off Suspend to RAM Suspend to Disk Charging 3-6 hours depending on temperature and processes running 3 hours Discharging 3.5 hours 72 hours 7 days NOTE A fully charged battery can power the computer for approximately four to five (4-5) hours, depending on usage patterns. If your computer also has the optional Media Bay battery, it will power the computer for an additional two to three (2-3) hours. Heat Considerations The computer's processor has been specially designed to consume as little power as possible. However, working in a hot environment, or working for long periods may raise the temperature. Your computer takes the following steps to lower temperature: „„ The cooling fan turns on. You may hear the fan and feel air coming from a vent on the left side of the computer when this happens. „„ If the temperature continues to rise, processor activity is reduced. You may notice a slight loss of performance if this happens. „„ To prevent damage, if the computer gets too hot, the processor stops and the computer shuts down. Battery Calibration Over time, as the battery is repeatedly drained and recharged, battery runtime may decrease. Calibrate the battery the first time you use it and then periodically for maximum performance. The calibration process empties and charges the battery. This allows the Windows battery gauge to accurately monitor battery status. Battery calibration will take from 6 to 12 hours, depending on how much power the battery already contains. The unit will not suspend while calibration is running. It is okay to use your computer during battery calibration. CAUTIONS „„ Do not disconnect AC power while battery calibration is running. „„ Do not remove the battery while battery calibration is running. When to calibrate the battery: „„ The first time you use it „„ After it has been in storage „„ If the gas gauge has become inaccurate „„ Every three months for optimum performance Windows XP Battery Calibration 1. Select Start, All Programs, and Mobile Computer Tools. 2. Select Battery Calibration. General Dynamics Itronix | 72-0137-003