3900/3950HD/3950C (250-3580/86/87) Battery Faxback Doc. # 2699 25-3584 - Ni-Cad Battery Pack, available from National Parts (NP#CS0200). NOTE: Backup battery part number is (CS-0247), under catalog number (250-3580). AUTOMATIC BATTERY PACK CHARGING FUNCTION The Notebook has two built-in rechargeable battery packs. As long as the AC adapter is attached to the computer, the battery packs are automatically charged. When one pack is fully charged, the other will continue to charge until it is also completely charged. The Battery A symbol and Battery B symbol in the system window will indicate the battery status. More information on battery charging is in the next section. THE BATTERY POWER SYSTEM The Notebook's Ni-Cad removable battery packs are inserted in the compartments that are seated at the left and right sides of the computer, behind two access panels. Two battery packs are already installed in the computer when you unpack it. Two fully charged packs will provide approximately 2.5 to 3.5 hours battery life of use before you have to recharge or replace the batteries. Additional battery packs can be purchased separately. Before you use the computer on battery power for the first time, check to make sure the battery is fully charged by referring to the information provided in the System Window display panel. CHARGING THE BATTERY The Notebook automatically charges the battery packs as long as the AC adapter is attached to the computer. The charging process has no relation to the power switch. To charge the batteries perform the following steps: Step 1: Make sure there is at least one battery pack in the compartment. Open either the compartment by sliding the latch which is in front of battery cover door backward, and then open the door. If there is a battery in the compartment, close the cover. If not (for example if you removed it and forgot to put it back in), slide in a battery pack and close the housing cover. Be sure to install the battery in the correct direction with the contact pads facing the bottom surface of the compartment. Step 2: Attach the AC adapter to the computer as described earlier. Step 3: Check the status of both Battery pack A and B on the System Window. If the Battery status does not light or flash, this indicates a problem. Check that all connections are secure. If you can't locate the problem, this condition may indicate a short somewhere either in the circuitry or the battery. Change the battery pack if you have a spare one to see if the problem persists. Step 4: Charge the battery for about 2 hours for each pack. If possible, always charge the battery completely. NOTE: If there is still a problem, do not attempt to charge the battery. Consult your dealer for instructions. The computer will switch to charge the second battery automatically if the second battery is installed. When all battery packs in the computer are full, the charging process will automatically stop and you can see the status from the system window. A timer safety feature stops the charging after 2.5 hours for each pack if the adapter has not automatically stopped charging. This prevents dangerous conditions from occurring if there is a fault somewhere in the charging circuity. REFRESHING THE BATTERY When you use the batteries and repeatedly recharge them, after a period of perhaps 4 to 6 weeks you should completely discharge the batteries until the system will not run and then completely recharge them. This ensures that the batteries will give you optimum performances and always recharge completely. If you notice that the battery life seems to be decreasing you should do this as soon as it is convenient. USING BATTERY POWER The battery system provides about 2.5 to 3.5 hours of power to the Notebook. This figure will vary depending on how you use the power saving features and your general work habits. The system window will indicate the status of Battery packs A and B when you are using battery power. The patterns related to power on the system window has the following modes: We recommend you use the AC power adapter as often as possible to conserve your batteries and to limit their use to situations when plugging into an electrical wall outlet is not feasible, such as when traveling. When you are using the AC adapter and the system is on, the "plug" symbol appears in the System Window screen. If the system is off and AC remains, the "plug" symbol flashes every 1 second. VARIOUS BATTERY PATTERNS Battery A's pattern is for the right side pack, while Battery B's pattern is for the left side pack. When you are not using the AC adapter, the computer is using the battery power. *When you use the batteries to supply power you might see any of the following symbols associated with the battery's power status: -Battery exists and is unused, the symbol will appear like a battery. -Battery energy level is above "Low Battery" and in use, the pattern look like a battery with a flashing in the middle (the inner bar flashes, with the frequency of On=3 seconds, Off=1 second). -Battery energy level is below "Low Battery" and in use, the pattern looks like a the whole battery is flashing (the inner bar and battery flash every 1 second). -Battery energy level is below "Low Low Battery" and in use, the pattern looks like the whole battery is flashing but, (the inner bar and battery frame flash every 0.25 second. -Battery exists and empty, the symbol appears like a battery with nothing inside of it. -No battery exists, the symbol disappears completely. *When you use AC adapter to supply power -Battery exists and is under charge, the pattern looks like a battery with the inner bar flashing every one second. -Battery exists and is finished charging, the pattern looks like a whole battery not flashing. -Battery exists and is not full, the pattern looks like a battery with nothing in it. -No battery exists, the symbol disappears completely. If your computer is installed with two battery packs, then when the first pack is exhausted and the second one runs into "low low battery" state, the system will be forced into suspend mode if auto suspend is enabled (by system setup mode program). If auto suspend is disabled, you should press the suspend/resume button manually to go to "suspend mode" and connect the AC adapter, or if you have an additional battery pack, install it. To extend the battery life, we recommend you make full use of the power saving features built in the computer as discussed in the Power Management Section. SMALL BATTERY FOR REAL TIME CLOCK There is a built-in small battery pack to keep the system information. If you do not install any battery pack and also do not run the computer with the AC adapter, then the maximum service time of this battery is less than 10 days. Please avoid this condition by putting in at least one battery pack, or using the AC adapter within 10 days. WARNING: Don't remove the battery pack which is under "IN USE" condition, otherwise, the system will lose power and turn off. (smc-02/18/94)