I have an ASUS laptop bought a year ago. Last week the battery wear level was at 20% and the very week after the warranty expired it suspiciously stopped charging fully and now, a week later it's at "0%, plugged in, not charging".

They wont aknowledge my warranty and a new battery costs a small fortune. I wonder if ASUS should maybe advertise that their laptop requires a yearly payment equal to 15% of it's original cost...

My frustrations aside, I'm investigating if there could be other potential fixes. Maybe the battery is fine and it's just Windows being confused. One of the options I'm currently looking into is updating my BIOS because some people claimed that helped.

My question is then, should I try the BIOS update? And what else can I try?

Oh, I should note I did try reinstalling the Windows battery driver in the device manager.

  • It is not a totally uncommon thing for something to wear out just past the warranty period. I had a similar problem with a consumer item many years ago. The 1st item I bought wouldn't work a week after warranty elapsed. Because of circumstances I had to purchase the same item - 10 years later it's still working well.
    – Xavierjazz
    Jun 27, 2015 at 12:46
  • As to 'I wonder is ...". No. It is well known that batteries degrade. Not just for laptops or one specific brand, but for mobiles, camara's, MP3 players, laptops, BBU's, .... Knowing this is part of the cost of the item you buy. (Mind you, not all will degrade eually. But on avarage assume you will have to replace a laptop battery after 3 years. And assume it will get much more expensive for older (8+ y.o.) laptops.
    – Hennes
    Jun 27, 2015 at 13:54

1 Answer 1


The battery itself is likely still good. But it must be "jump started". Sometimes, (but seldom), it will spontaneously start charging again. There are also several possible, but difficult, methods of restarting it. You can prevent this in the future by NEVER allowing your PC or cell battery to come close to completely discharging. First, a little background:

Inside your battery pack, there is a master program circuit that is designed so that if it does allow charging, it doesn't explode from overheating. These programmed circuits simply determine if each individual cell inside is already charged to at least about 10%. If it did allow charging when a cell is completely dead, it would take much more power to charge, which creates a lot more heat. Overheating is physically dangerous to each cell, the battery pack, your PC, you, and those around you, since cells do occasionally explode.

Inside each individual cell, there's also another circuit that looks at its own charged state to determine if it will allow or disallow charging. Your battery pack and/or an individual cell is is "off" right now.

Depending on the circuitry of your individual battery pack, there are ways of quickly overcharging without explosion. There are expensive devices that reportedly can bring back about 40% of the "totally dead" cell batteries. Without this overcharging device, your only option is to open the battery pack and/or an individual cell, bypass the safely circuitry, and quickly charge it without overheating it. As soon as it is charged above that safety threshold, your battery pack will be fine once again. Just find someone that has enough discrete electrical component engineering experience before you try this.

I've written more about PC batteries here: What happens when laptops reach 100% charge?

[EDITS added] For a more thorough, authoritative, and better understanding, this is a great jumping off point to perhaps find a way to revive, (turn back on), your dead battery: http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries

On their site is also an extremely helpful page about battery pack repair. http://batteryuniversity.com/learn/article/how_to_repair_a_laptop_battery I was shocked to learn just how smart these packs have become. Even more disturbing is mention of SUPER-secret OEM codes they won't reveal, that are sometimes required to turn batteries back on after x amount of use! (I'd like to expose any OEMs' products that employ this despicable practice.) I also found this extremely hopeful comment from "BatteryHacker" on this page from someone that discovered how they easily fixed their dead battery:

This Dell NDE076 replacement battery has been replaced in warranty 3 times in 1.5 years!!! Because somehow after a time, its controller circuit gave up. That means no charging, no energy, no charge report anymore. After the 3rd replacement, I decided to open it and saw the controller (Atmel mega406). The cells were charged, somehow the controller went in a state (probably blocked), and that I had to reset it. It has a RESET pin :)) ! That helped, and [then] I had to fully charge and discharge to teach the controller again. I think I will have to repeat it if the problem occurs again! [Evidently] One must know there is firmware in this controller and this “blocked state” issue can occur due to a firmware/hardware bug.

  • 1
    While it may be reassuring to know that it might be possible to fix the battery, this isn't really an actionable answer (other than find somebody who can try to fix it). Can you expand the answer at all (without endangering the reader)?
    – fixer1234
    Jun 27, 2015 at 15:26
  • 1
    I would also go for a slight endangering of a reader.
    – Darwin
    Jun 27, 2015 at 15:44
  • The value is knowing there are alternatives to spending ~$100 for a new battery. It's likely his current battery, (pun intended), is ~80% as good as new. Providing a partial, albeit difficult answer requires investing more time in finding an expert, a service, or that magical device that can revive a dead LiON battery pack. But, since I know they do exist, it might be worth it, vs. if he knew it really was hopeless. thus saving him considerable time searching for a non-existing solution. Just because it is difficult, doesn't mean it isn't an answer he could choose to invest pursuing.
    – DaaBoss
    Jun 27, 2015 at 15:51

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