Maintenance & Service Guide
Presario 1800 Series
Models: 1825 and 1800T
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Battery Pack Operations
This appendix covers the following information concerning battery pack operating time:
●Increasing battery pack operating time
●Conditioning a battery pack
●Disposing of a used battery pack
Increasing Battery Pack Operating Time
Battery pack operating time differs depending on several variables. To avoid unnecessary replacement, consider the following variables when determining how long a charged battery pack should last:
●Power management settings
●Hardware configuration
●Software applications
●Installed options
●Display brightness
●Hard drive usage
●Changes in operating temperature
●Type and number of installed PC Cards
NOTE: The power consumption requirements for PC Cards vary widely. Some cards drain the battery pack very rapidly.
Battery pack operating time can be increased by as much as 50 percent by controlling the energy required by the computer and the energy stored in the battery pack.
Minimizing the Energy Required
To minimize the energy required by the computer, follow these guidelines:
●Set the power conservation levels in the Power Management utility to Maximum.
● Customize the timeout value to work more efficiently with the applications. The length of battery life depends on the values selected.
Maximizing the Energy Stored
To maximize the energy stored in the battery pack, follow these guidelines
●Condition the battery pack at least every 30 days to improve overall battery performance.
●Keep a battery pack in the computer when using it with AC power to supply the battery pack with a constant trickle charge.
●Store the battery pack in a cool, dry place when not in use.
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Conditioning a Battery Pack
CAUTION: To avoid a loss of data, ensure that all data is saved before discharging a battery pack.
To condition a battery pack, complete the following steps:
1.Plug in the AC adapter and allow the battery to charge until the battery charging status icon turns off. Your battery gauge may show four bars (and Windows may report 100%) before the battery charging status icon turns off. Do not unplug the AC adapter until the battery charging status icon disappears.
2.Unplug the AC adapter and allow the battery to drain until the computer reaches hibernation and turns itself off. Do not plug in the AC adapter during this process or you will need to restart with Step 1. You may use the computer while the battery is draining.
3.Plug in the AC adapter and begin using the computer.
The table below shows the approximate battery pack charge times.
Approximate Battery Charge Time
Computer | On Line | Off Line |
Li ion Battery Pack | 4.5 hours | 2:50 hrs |
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Disposing of a Used Battery Pack
In the interest of safeguarding our environment. Compaq Computer Corporation recommends that nickel metal hydride (NiMH) and lithium ion (Li ion) battery packs be recycled. Battery packs should be handled in accordance with country, state, province, or local regulations.
CAUTION: Never attempt to open or service a battery pack. Opening a battery pack not only damages the pack and makes it unusable, but also exposes potentially harmful battery components.
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