Asus C21-x402 Laptop Akku Fuer X402c Series, X402 Series ersatz

First of all, you need to assure the model of your laptop or the part number of your laptop battery. Then look for the battery you need at Laptop-Battery. Finally, you can check whether the battery you find is compatible with your laptop or not on the "Compatibility" table (for example, Lenovo ThinkPad P72). If you don't know how to find the right battery for your laptop, you can click "How to find one correct battery for my laptop?" for more details. Moreover, you can click the link "Contact Us" on the bottom of this page to ask us.

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Laptop computers are designed to recharge the battery while the laptop is plugged into the AC adapter "brick." After a period of time, however, the battery may begin to fail to recharge fully, may seem to have a shorter charge-life or may no longer charge at all. This is quite common: Laptop battery technology just isn't in place yet to guarantee long battery life and flawless performance. Unfortunately, there may be little you can do to revive a really dead battery except to replace it.

1. Remove the battery from the laptop. Look at the sides of the battery. You may find a small panel with three or four LED lights or some kind of labeling referring to battery life. Depress the button or part of the panel that appears to light the LED lights. If your battery is functioning normally, you will see one, two or three ''light bars'' indicating the amount of charge left in the battery. If none of the lights appear when you test the battery, chances are the battery is dead and can no longer take or hold a charge.
2. Place the battery back into the laptop. Turn it on, using AC adapter power. When the desktop boots, look for the battery indicator icon in the lower right hand corner of the screen, down near the clock. You should see a battery picture. Hover your mouse over this icon to see how much power is left in the battery. Windows should tell you that the battery is now charging. If there is a red X over the battery, the battery has no charge at all and is probably dead.
3. Go to ''Start'', ''Control Panel'' and ''Power Options''. Check the battery recharging tab. If the battery is able to take a charge, there will be an indicator that charging is happening now. If the battery can no longer take a charge, there will probably be a red X over the battery icon. Shut down your laptop.
4. Remove the battery and place it in a plastic bag with a zipper lock. Place the battery in the freezer compartment of your refrigerator for 24 hours. At the end of the 24 hours, remove the battery from the freezer and let it ''thaw'' for two hours. Put the battery back into the laptop (being certain that it is completely dry first). If you're lucky this freezing may bring the battery back to life--at least for a short time. If the battery is still dead, your diagnosis is over.
5. Replace the battery if all else fails. Visit the site of your computer's manufacturer for the exact replacement battery for your make and model of laptop. Buy only new batteries.

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The charm of a notebook computer is you can easily transport it from one location to the next. Whether you are moving the laptop from one room in your house to another or taking it on vacation with you, portability is a laptop's primary asset. However, portability becomes compromised when your notebook's battery no longer charges, because you then have to keep your computer plugged in at all times. There are three primary reasons a notebook battery won't charge, and none of the resolutions are cheap.

1. Bad Battery
   Sometimes the battery refuses to take a charge because the battery itself is bad. Whether it is prematurely defective or several years old, a bad battery will refuse to charge. Replacing a bad battery can be expensive, with aftermarket replacements starting around $100 as of the time of publication. If your computer is still under warranty and it has a bad battery, contact the manufacturer to find out if you can have the battery replaced under the warranty. Otherwise, use the age of the computer as well as the cost of the battery to determine whether it is worth replacing.
2. Bad Motherboard
   As with batteries, notebook motherboards can start malfunctioning with age, though some are also prematurely defective. In these cases, the portion of the motherboard that relays power from the DC jack to the battery no longer works. Unfortunately, this also requires you replace the entire motherboard. Motherboards are normally covered under manufacturers' warranties, so if your warranty is still valid, you may be able to get a free fix. If the notebook is not covered under a warranty, though, the cost of the repair is rarely worthwhile, as motherboard replacements -- once you factor in parts and labor -- often cost more than the notebook itself.
3. Bad AC Adapter
   If your AC adapter is faulty, your battery will not charge properly. Minor internal breaks and fractures in your power cord can cause power to intermittently get to your battery, while a dead AC adapter will force your computer to run on battery power until the battery completely loses charge. The power cord is the easiest notebook part to replace, as many universal adapters are available for purchase. While a replacement AC adapter is still expensive, it is significantly cheaper than having to replace a battery or motherboard.
4. Troubleshooting
   Troubleshooting a battery that does not charge is rarely a do-it-yourself task; without the right tools and knowledge, the only element you can test yourself is the AC adapter. You can do so by removing the battery from the notebook computer, plugging the notebook into the wall and attempting to turn it on; if the laptop turns on, your AC adapter is functional, but if it does not, the AC adapter is faulty. If your AC adapter is functional, the next step is to take your computer to a certified technician to figure out the exact reason -- or sometimes, reasons -- why your battery is not charging.