Hi,
do the following
1. Carefully turn your system upside down.
2. Locate the battery compartment on the bottom
3. Press the arrow on the cover to slide the compartment open.
4. Match the large (-) terminal on the battery to the small terminal on the clip (which lifts out
of the compartment for easier connection).
5. Snap the terminals together firmly.
6. Slide the cover closed.
Use a standard 9V battery (IEC 6F22 in Europe), available at most retail stores. Use an
alkaline battery for longer backup time.
Open Power Options by clicking the Start button, clicking Control Panel, clicking System and Security, and then clicking Power Options.
On the Select a power plan page, next to the plan you want to change, click Change plan settings.
On the Change settings for the plan page, click Change advanced power settings.
On the Advanced settings tab, expand Battery, expand Low battery level, Reserve battery level, and Critical battery level. Change the percentage of battery remaining that you want for each level, and then click OK.
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