6cell DELL KM769 KM742 Battery info:
Battery Type: Li-ion
Capacity: 56Wh / 6Cell
Size: 205.36 x 52.60 x 20.90 mm
9cell DELL KM771 WU841 Battery info:
Battery Type: Li-ion
Capacity: 85Wh / 9Cell
Size: 223.40 x 74.60 x 20.90mm
Compatible original Battery Code:
312-0762 312-0769 312-0902 451-10616 KM742 KM752
KM760 KM769 KM771 KM970 MT186 MT187 MT193 MT196
MT332 P858D PW651 PW640 PW649 RM656 RM661 RM668
RM680 T749D U116D U725H W071D WU841 WU843 WU852
X064D X644H Y568H
DELL Latitude E5400 Series
DELL Latitude E5410 Series
DELL Latitude E5500 Series
DELL Latitude E5510 Series
Tips and tricks
After shelling out for a new one, I asked around and found a battery expert who has some solid tips on how to give laptop batteries a long and energy-rich life.
1, Keep the Laptop Off Your Lap
DELL KM769 Battery like to be at room temperature, and I don't mean like a room in the tropics," says John Wozniak, a distinguished technologist for Hewlett-Packard.Although most of us call our portable PCs laptops, today's high-performance notebooks aren't designed to sit on your lap. Sure, they get warm and you may start to feel uncomfortable after a while, but that's not the point.
Most laptops have little legs on the bottom, designed to let a bit of air flow underneath. When you're working on a hard surface, like a desk, there's no problem, but when the notebook sits on your lap, it sinks down a bit and air can't circulate.
That can become a real issue rather quickly if you're watching a movie, since playing a DVD keeps both the CPU and the graphics chips busy and running fairly warm. You can avoid the DELL KM742 Battery problem by working on the folding tray if you're flying, or spending $20 or so on a pad stiff enough to give the laptop a bit of clearance.
Keeping the vents on your laptop clean does a lot to keep heat from building up. A simple, but effective method is to buy a can of compressed air from any computer shop or hardware store and blow out the dust.
2, A Little Unplugging Helps
Not so long ago, Batteries were NiCads, that is, nickel cadmium based. That design had a fairly major flaw: if the battery was consistently charged before running most of the way down, it would no longer take a full
charge, no matter how long it was plugged in. That was called battery memory, and the solution was to drain them every now and then and be sure they got a full charge.
Today's lithium ion DELL KM771 Battery don't have that problem, so don't worry about recharging before the power gauge is hovering near empty, says Wozniak.
However, leaving them plugged in all the time isn't a good idea either, although it's tempting. In effect, the battery gives the user an uninterruptible power supply, so if you expect the electricity to go off unexpectedly, it makes sense to keep the battery in place when the machine is plugged in.
But do that too much, and your DELL WU841 battery will degrade. So remove it if you don't plan to work unplugged for an extended period of time. The best way to store a lithium ion battery is to let it drop to about 60 percent of its charge and be sure you keep it in a reasonably cool place, he says.