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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I think that Kodak recommends Li Ion batteries which have a higher voltage on them.
I got some generic Li ion battery packs off of Amazon.com, with better specs. than Kodak, and they work fine for my Easyshare z1485 IS camera.
It cost me like $80 to get the charger and two battery packs that are Li Ion, but it's worth it.
My battery packs are rated at 2000 mAh 3.7 Volts each. It's the voltage that counts. You see, if you would split that in half, the voltage for each AA battery is 1.85V which is much higher than the 1.5V that regular Alkaline or Ni MH batteries are rated at.
I tried Alkalines, and Ni MH to no avail. But, the Li Ion batteries, did the trick for me.
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.
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.