By using the dell 312-0815 battery as long as you can during the day, and then allowing the battery to charge at night as you sleep, you will be taking advantage of much cheaper power rates. This is a practice we have recently begun using and have begun to see the cost savings. In most areas, this overnight rate is 3 to 4 times cheaper than power used during the daylight hours. This 9-cell 312-0815 battery delivers the longest computing time off the grid.
Also, when you use your laptop and have it running on battery power, automatically the laptop adjusts to run in a power saving mode (e.g. slightly dimming the lcd, and slowing the cpu speed - still powerful enough for 99 percent of the computing most of us do). Finally the best way to save money and power is to remove your dell 312-0815 battery when it is fully charged, modern laptop batteries can hold their full charge for months. Using your dell laptop battery until it is dead then recharging it will wear it out much more quickly, which, as we know, can be very expensive to replace. Another energy saving tip: Your laptop's DVD drive and LCD brightness require the most electricity. Limit their use, and you will save even more.
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