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  Rebuild your ASUS Q400 R404 Computer Battery

ASUS Q400 R404 battery

List Price: $189.99
Our Price: $179.90
Off List Price$10.09!

Availability:: Usually Ships in 2 to 3 Weeks
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Rebuild your ASUS Q400 R404 Battery

The parts for this Asus Q400 or R404 laptop battery are no longer available.

It is possible however to rebuild your current Asus Q400 or R404 battery pack and replace the worn out lithium cells with brand new lithium -ion battery cells.

In the rebuilding process, we will remove the old worn-out and replace them with brand new lithium cells using the highest quality Panasonic cells. The computer chip set & electronics inside the battery pack as well as your existing battery cartridge will be reused. You will receive your original battery pack back with brand new cells inside.

The battery pack will be tested and even fully charged when shipped back to you. It will carry a full 1 year warranty.

The replacement is 100% compatible with the original battery specifications. This battery is rated at 11.1 Volts and 5200 mAh capacity.

To order this rebuilt battery pack, add this item to your shopping cart and finish the purchase process.

Once the battery is purchased you will receive a email confirmation of your order.

Then include a copy of your order number with your battery as you ship it to us. You are responsible for the shipping costs to us. We will pay for the shipping costs to return it to you.

It takes us about 2 weeks to rebuild your battery pack. You can estimate about a week in shipping time from you and then from us. Your laptop will work without a battery as long as it is plugged into the wall.

The battery can be shipped to:

Laptop Battery Express

38788 Arbor Ct

Grafton, OH 44044

Attn: Rebuild Dept

  • Brand:
  • Voltage:
  • Battery Capacity:
  • Battery Type:
  • Cell Origin:
  • Color:
  • Assembly Origin:
  • Warranty:
  • Guarantee:
  • Useful Life:
  • XTend Q400 R404 computer battery
  • 11.1 Volts; equivalent with 10.8 volts
  • 5200 mAh
  • 6 Cell Li-ion
  • Panasonic (Japan)
  • Black
  • Assembled in China
  • 2 Year Warranty
  • 30 day full satisfaction guarantee
  • 300-500 recharge cycles

You can expect about 3-5 hours of run time with this computer battery when new, depending on your energy use.

Like all Li-ion primary batteries, your run time will decline over time.

This battery replaces the Asus Q400 R404 family of laptops.. The battery part number printed on the battery label is so tiny, you will need a magnifying glass to see the battery part number. If your model matches the listing of Asus machines at the extreme bottom of this web site, this is the correct battery for your Asus computer.

Replaces these many Asus Q400 and R404 laptop battery part numbers:


How to care for your ASUS Q400 R404 battery.

You can extend the life of your ASUS Q400 R404 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 q400 battery below the 3% critically low warning point. If your battery is run below this point it may not have enough energy to even recharge. This may effectively "kill" your battery.

How can I extend my ASUS Q400 R404 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 2-5 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 number drain on your 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 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.

Compatible AC Power Adapters designed for this product
AC power adapter for Asus laptops
Our Price: $49.00

AC power charger for asus laptops

This battery & adapter are compatible with the following laptop models. In addition, if your battery or adapter part number matches the list above, this battery will be comapitble even if your specific computer is not listed.

Asus Laptop Batteries > Q400
Asus Laptop Batteries > Q400A
Asus Laptop Batteries > Q400C
Asus Laptop Batteries > Q400V
Asus Laptop Batteries > Q400VC
Asus Laptop Batteries > R404
Asus Laptop Batteries > R404A
Asus Laptop Batteries > R404C
Asus Laptop Batteries > R404V
Asus Laptop Batteries > R404VC