The standard battery uses two 3.7V lithium cells that are larger in diameter and length than AA's (1.5 V) for a total voltage of 7.4 V and something like 1100 mAh. Replacement cells are available from places like batteryjunction.com.
AlanComputerTech.com carries a AA adapter. This holds 4 AA cells. See hpcnec.com for more information.
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Re: Using AA batteries in nec mobilepro 790
No absolutely not! i have not read that any were but if it was possible what you would have to do would be semi dangerous (for you and the device). if you want to take the chance then remove the battery (don't open the battery it self) then there should be some gold conecters that are on the battery and the nec there should be at least 2 conect the batterys to eachother and then to the conecters and hopefuly it will work (this is realy not that easy but you can try)
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These are older devices, and Lihium-Ion batteries degrade from the date of manufacture. You will most likely need to follow instructions (easy to find on the internet) to "fix" the battery. It needs two new cells.
This is an intermittent issue with Microsoft Handheld PC 2000. There is no fix at this time. Please adjust the time manually if your MobilePro does not automatically adjust the time for Daylight Saving Time.
Lithium Ion batteries prefer a partial rather than a full discharge. Repeated full discharging robs the battery of its capacity (useful life), the Lithium Ion battery prefers shallow over repetitive deep discharge cycles.
Besides cycling, the performance of the Li-ion is also affected by aging. Capacity loss through aging is independent of use however the capacity is affected by both aging and usage.
Battery wear-down on lithium-based batteries is caused by two activities: actual usage or cycling and aging. The wear-down affects by usage and aging apply to all batteries but this is more pronounced on lithium-based systems. The Li-ion batteries prefer a shallow discharge. Partial discharges produce less wear than a full discharge and the capacity loss per cycle is reduced.
Simple Guidelines to extend useful life of the battery
Charge the Li-ion often, except before a long storage. Avoid repeated deep discharges.
Keep the Li-ion battery cool. Prevent storage in a hot car. Never freeze a battery.
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.
Note: It may be necessary to depress the power button more than once to properly initialize the power management circuitry before the unit comes on.
Note: It may be necessary to connect AC power to the unit and allow it to charge before attempting to apply power. The unit will not power up if the battery voltage is below a safe operating level.
Please refer to the leaflet "NEC MobilePro 900, Performing a Hard Reset" that was shipped with the unit for the procedure to perform a hard reset on your MobilePro 900.