How to check my battery is charged on my Dell Latitude D600 laptop?
For the battery, press, and the amount of light will appear the state of the load. If you see any lights, you have a fully charged battery. Any light that appears accounts for approximately 20% charge.

To battery health, hold the button on the battery at least 3 seconds. If no lights appear, the battery is in good condition and approximately more than 80 percent of its original charge capacity remains. Each light represents a gradual degradation. If five lights appear, remains less than about 60 percent of the charge, and you should consider replacing the battery.
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bottem right of your screen in the task bar if its unplugged there will be a little battery icon double click or hovver over it and it should tell you the percentage left and the time you have (roughly)
Hope that helps
or go to ur power settings in ur control panel