If the plug from the wall is not the cause of battery for dell latitude d820 load fails, the following suggestions may help.
1. Check if the AC adapter is bad or not. Remove the battery from the laptop and turn on the computer connected to the outlet. If your laptop does not light, try another power adapter to see if the first is defective. If the second test does not work so well, the problem may be the power circuit of the motherboard. Find a certified computer technician to help solve the problem.
2. If the computer turns on, the adapter is in good condition and not causing the problem. In this case, try putting another battery that meets the technical specifications of the appropriate test laptop. If the new battery works well, we can conclude that the first one is defective.
3. Determine if the problem is not caused by a problem related software. If the laptop battery status are not displayed correctly when the software can be considered that the software is causing the problem and not really of the battery.
4. The power reset the unit by disconnecting and removing the battery. After doing that, hold the power button for a minute. Then connect the adapter and battery power, and start the laptop again. This method is being done to ensure that the motherboard is no more holding capacity when the battery fell causing a "hiccup" in the system. This may solve the lack of battery dell inspiron 6000.
5. If the battery stops charging each time the charge indicator reaches 96-98%, the laptop may be necessary to re-calibrate a new battery. To recalibrate right notebook, the Windows power management must be configured to prevent the system from standby or hibernate when the battery reaches a low level. For Windows XP, go to Control Panel> Performance and Maintenance> Power Options. Set "Power Schemes" to "Always On". In the "Alarms", uncheck "Low battery alarm" and "Critical battery alarm." Under "hibernation", uncheck "Enable hibernation" and then click Apply. Do this procedure, the laptop battery can now be completely drained until the computer system shuts down. Then the adapter back into the outlet and let it charge fully. Sometimes the cycle should be repeated 2-3 times before it actually reaches the load at 100% capacity. The charging process should last at least about 14 hours.