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  Dell Latitude E6400 E6500 and Precision M2400 M4400 M6400 Battery

Dell Latitude E6400 E6500 Laptop Battery Precision M2400 M4400 M6400 laptop battery 312-0748, 312-0749, KY477, FU571,NM631,PT434, KY265
Dell PT434 KY265 Latitude Battery

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Dell Latitude E6400 E6500 & Precision M2400 M4400 Battery for Dell PT434 and KY265

Does your Dell battery not last as long as it used to? Revive your battery life and improve laptop performance with a replacement Dell Latitude PT434 battery from Laptop Battery Express. We use the highest quality lithium-ion battery cells that charge faster and last longer.

This Dell rechargeable battery is compatible with the Latitude E6400 and E6500 series and the Precision M2400 and M4400 laptop models. It is also compatible with the Dell PT434, KY265, 312-0749 and KY477 battery part numbers. Additional compatible laptop models and Dell battery part numbers are listed below. You can find your part number listed on the bottom of your laptop next to the P/N tag. Don't see your model listed here? Go to our Dell laptop battery page for the full catalog or call our tech support. Chances are we've got it in stock!

We're serious about quality. That's why we use the highest quality li-ion battery cells and components. Quality parts can make the difference between a 6 month lifespan or a 4 year lifespan. We're so confident in our laptop battery quality that we back each one with a 2 year warranty and 30 day return.

This is the highest rating available for a 6 cell battery pack. The higher the mAh rating, the longer your battery will run before it needs to be recharged again. There are no compatibility issues if your existing battery is rated at 4400 or 4800 mAh or a lower Whr. Simply put, more is better. And yes, this battery is probably better than your original!

  • Brand:
  • Voltage:
  • Battery Capacity:
  • Battery Type:
  • Cell Origin:
  • Color:
  • Warranty:
  • Guarantee:
  • Useful Life:
  • Xtend
  • 11.1 Volts - also compatible with 10.8 Volt systems
  • 5200 mAh or 56 Whr; runs longer than 4400 mAh batteries
  • 6 Cell Li-ion (9 cell available here)
  • Samsung (South Korea)
  • Silver
  • 2 Year Warranty
  • 30 day full satisfaction guarantee
  • 300-500 recharge cycles

Compatible with Dell Latitude and Precision battery models:


Laptop Battery Express only deals with brand new premium computer batteries. We never carry recycled or used batteries. We only use the highest quality cells inside the battery pack so you will have a long service life (300-500 recharge cycles). We do not use cheaper battery cells which can wear out in a little as 3 to 6 months. Our inventory turns rapidly and you will always receive a freshly manufactured battery.

How to care for your Dell Latitude E6400 E6500 and Precision M2400 M4400 battery.

You can extend the life of your laptop battery significantly through the proper care and handling of your battery.

  • Any new laptop battery should first be fully charged by leaving it plugged in overnight. Once a computer battery is fully charged it will no longer accept any more power. It is a common practice to leave laptops plugged in after they have been turned off so that the battery has a full charge the next time you use your laptop. It is probably fully charged within 5 hours.
  • A brand new notebook battery is in a weakened condition since it has not been conditioned yet. Condition and break in your new battery by performing 5 partial discharge and recharge cycles the first week you receive your new battery.
  • Run on battery power without the AC adapter cord at least once a week to keep the battery cells active and at their peak potential. When your laptop is plugged into the power adapter the battery goes to "standby mode" while your laptop runs directly on electricity from the wall outlet.
  • Even though your battery indicates it is fully charged, your battery will return to a weakened state again in a few months if it does not get some exercise through partial discharge and recharge cycles while running on battery power alone.
  • If your battery has not been actively used 2 months or more, condition your battery again with 5 partial discharge & recharge cycles to increase the batteries capacity and run time.
  • Don't run your battery all the way to empty. Your battery will have a longer service life if it receives shallow discharge and recharge cycles. Research has shown that the useful life of the battery will be much longer if you begin to recharge the battery any time before reaching 20% of the remaining power capacity. Recharging the battery even after 10 minutes will not reduce the battery's life span as lithium batteries do not have the memory effect which was found in older NiCad battery technology. NiCad batteries have never been used in laptops, even the earliest models.
  • Never run your battery below the 3% critically low warning point. If your battery is run below this point it may not have enough energy to recharge. This may effectively "kill" your battery.

How can I extend my Dell Latitude E6400 E6500 and Precision M2400 M4400 battery run time?

You can extend your battery run time by minimizing the power drain on your battery. A 6 cell battery will run approximately 2 to 2-1/2 hours when the battery is new. Even longer times can be achieved by minimizing the power consumption of your laptop. Here are the top ways to reduce your power consumption.

  • Reduce the brightness of your laptop screen. This is the main drain on your Dell Latitude E6400 E6500 and Precision M2400 M4400 battery by far.
  • Avoid using the CD or DVD drive as the motor consumes a fair amount of power.
  • Turn off your wireless finder if you are not using the internet.
  • Remove any devices plugged into your USB ports or other ports.
  • Close out programs you are not using. By minimizing the load on your CPU, sometimes you can avoid having the cooling fan turn to its high speed mode.
  • Increase your memory to at least 4 Gigabytes. This creates less work for your hard drive. Data is temporarily written to your hard drive when your memory is not sufficient to hold all the data on the many pages you may be accessing.
Video description of battery

Compatible Laptop Chargers:
PA10 AC Adapter for Dell Laptops 19.5 Volts 4.62A 7.4mm-5.0mm
Our Price: $49.00

PA10 dell ac adapter 310-2862 310-3399 310-4002 310-7698 310-7699 FF313