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As far as I know desktops do not have batteries unless you have an external UPS power backup system. If you are getting low voltage alarms or unexpected system shutdowns your power supply needs to be replaced. If you are using a laptop and you are plugged into an outlet and your battery is in this can cause the battery to go bad. E.I. if you use an outlet take out your battery.
I hope this helps.
Check that you are not using an app that is continuously accessing the internet and communicating with a server for some reason that is using the phones WiFi or mobile channel. This will drain battery life if incorrectly configured etc ( i.e selecting access to your location, services and other info )
Your power settings may be set up to inform you at 90% the battery is getting low.
Go to control panel, Performance and Maintaince(only in catigory view), Power Settings click Alarms tab and adjust the sliders to the desired.
Go to control panel, click change battery settings, find the option selected click the link below it saying Change Plan Settings, click the link change advanced power settings, go to the battery section and adjust the low battery level and critical level.
The MobilePro 900 back up battery is low and should be replaced. The battery is a CR2032 coin-cell battery, which is very common and can be purchased at most department and drug stores.
Refer to section 1-7 of the "MobilePro 900 Handheld PC's User's Guide" for detailed replacement instructions.
The back up battery should be replaced immediately upon seeing the message "Backup Battery Very Low - Your back up battery is very low or missing. Data loss may result from failure to replace the battery very soon. Consult the manufacturer's instructions for directions on replacing or charging the backup battery."
Warning: It is important to note that the back up battery in the MobilePro 900 is not rechargeable, thus, to prevent data loss, it is important to change the back up battery immediately when this message is displayed.
NEC has identified an issue where the system can erroneously generate the "Backup Battery Very Low" message. There are two possible solutions that will eliminate this erroneous low battery warning message (the first method is the preferred solution, the second method can be used if the update file is not available).
Solution I. Install a new version of the driver that controls the battery monitoring circuit.
1. Download the Low battery warning fix to your desktop.
2. Using ActiveSync or a compact Flash Card, copy FixBatt_HPC2K.EXE to the MobilePro internal disk.
3. On the MobilePro, double click the FixBatt_HPC2K icon.
4. When the message "Low Backup Battery Issue" is displayed, tap the "Patch it" button
5. When prompted turn unit over and momentarily depress the Reset button using the stylus.
Solution II. Change the default power management configuration.
Configure your MobilePro 900 to suspend when the LCD lid is closed on battery power and AC power.
To ensure that the device suspends whenever the lid is closed, please make the following changes and perform a soft reset:
1. Go to Control Panel.
2. Open MobilePro Settings.
3. Go to the LCD Suspend/Resume tab.
4. Place a check next to "Enable suspend while on External Power."
5. Click the "Advanced" button and place a check next to "Enable suspend while on External power.
6. Click OK to close the Advanced Setting window and click OK to close the MobilePro Settings.
7. Turn unit over and momentarily depress the Reset button using the stylus.
NOTE: Both the software update and power management settings are cleared on a hard reset and must be re-applied.