Charge GaugePress the status button on the battery charge gauge to illuminate the charge-level lights. Each light representsapproximately 20 percent of the total battery charge. For example, if the battery has 80 percent of its chargeremaining, four of the lights are on. If no lights appear, the battery has no charge.Health GaugeThe battery operating time is largely determined by the number of times it is charged. After hundreds ofcharge and discharge cycles, batteries lose some charge capacity, or battery health. To check the batteryhealth, press and hold the status button on the battery charge gauge for at least 3 seconds. If no lightsappear, the battery is in good condition, and more than 80 percent of its original charge capacity remains.Each light represents incremental degradation. If five lights appear, less than 60 percent of the chargecapacity remains, and you should consider replacing the battery. See "Specifications" for more informationabout the battery operating time.Low-Battery WarningA low-battery warning occurs when the battery charge is approximately 90 percent depleted. The computerbeeps once, indicating that minimal battery operating time remains. During that time, the speaker beepsperiodically. If two batteries are installed, the low-battery warning means that the combined charge of bothbatteries is approximately 90 percent depleted. The computer enters hibernate mode when the battery chargeis at a critically low level. For more information on low-battery alarms, see "Power Management."Charging the BatteryNOTICE: To avoid losing or corrupting data, save your work immediately after a low-battery warning.Then connect the computer to an electrical outlet, or install a second battery in the module bay. If thebattery runs completely out of power, hibernate mode begins automatically.NOTE: The AC adapter charges a completely discharged battery in approximately 1 hour with thePage 3 of 7Using a Battery9/19/2003file://C:\Documents%20and%20Settings\rpaxman\Local%20Settings\Temp\~hhEA52.htm