Main battery

Laptop main battery

Any laptop computer has a battery pack which provides power to the laptop while it’s not connected to the wall-plug through AC/DC power adapter. Laptop batteries come in many different shapes and they are model-specific.

The laptop battery life depends upon many conditions and circumstances: screen brightness, intensity of running programs, the temperature of the working environment, etc…

The same battery could last longer in the same laptop if you optimize the power usage settings in the control panel. You can lower screen brightness, reduce CPU processing speed, chance cooling method, and other settings available on your laptop. Some of these settings could be changed only through the manufacturer’s power management software.

In most laptops the main battery connects directly to the system board.

Battery connector

TROUBLESHOOTING LAPTOP BATTERY PROBLEMS.

Let’s say your laptop stopped running on the battery power. It works fine from the AC adapter but shuts down as soon as you unplug the adapter. If that’s the case, try reconnecting the main battery. Remove it from the laptop and install back. It’s possible the battery is not making good connection with the motherboard.

Unfortunately, the only reliable way to test the main battery is replacing it with another known good battery.

If the laptop cannot detect the battery, even though it’s installed, try replacing the battery with a new one. If you still have the same issue, most likely there is a problem wiht the system board.

 

35 Comments

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  1. 35
    jomz Says:

    Hi,

    I read Q&A and I really ned your help, I am bother of the light indicator of my laptop toshiba satellite c655 even it is 100% the light inicator is still orange normally if it reach 100% the color should be yellow green.Is there something wrong with my baterry or the light indicator is damage?

  2. 34
    johnjo Says:

    Repair Man
    Thanks for your reply.My initial problem was that at first Outlook Express and then Internet Explorer could not be opened.The guy who restored the connection for me also took the opportunity to replace the wireless card{I think that is what it is called]which apparently was no longer working.He said{or I understood him to say}that I would find it more convenient if I got myself a wireless router so that the laptop could be moved around.
    I said I thought it was not good practice to keep the battery at full charge because I undestood that it should be allowed to discharge itself from time to time to maintain it in good condition[as is recommended for the batteries in my cordless telephone}
    My problem is still that the laptop cannot be operated from the mains supply alone and that if the battery fails I shall have to buy a new one in order to get the laptop started.
    Thanks
    Johnjo

  3. 33
    Repair Man Says:

    @ johnjo,

    After a repair my Amilo M1405 laptop which had only ever been previously used plugged into the mains supply will now work only on battery power and shuts down after couple of hours or so of use after the battery has discharged itself.

    What was repaired?

    My temporary solution is to keep the battery charger permanently plugged in so that the battery is always at 100% capacity but I am not sure if this is good practice.

    Why do you think it’s a bad practice. I think a laptop suppose to work like that.
    I never remove the battery while the laptop is plugged into the mains. My battery always says “Fully charged (100%)”.

  4. 32
    johnjo Says:

    Hello,
    After a repair my Amilo M1405 laptop which had only ever been previously used plugged into the mains supply will now work only on battery power and shuts down after couple of hours or so of use after the battery has discharged itself.Any ideas how to fix this problem,please?
    My temporary solution is to keep the battery charger permanently plugged in so that the battery is always at 100% capacity but I am not sure if this is good practice.
    Thanks
    Johnjo

  5. 31
    Repair Man Says:

    @ Ed Hand,

    I have a Dell Latitude C840. The locking tab that holds the battery in has broken. I have been told I need to find a damaged unit so I can use the parts. Any suggestions would appreciated.

    The locking tab is part of the bottom cover. Yes, you can use latches from another cover but it will be necessary to disassemble the entire laptop.
    I saw this bottom cover on eBay for about $10+shipping.

  6. 30
    Repair Man Says:

    @ juan paulo,

    i have a hp g62 every time i turn it on the battery life left is only 94% but before i shut it down befor going to sleep it its fully charged because i use the ac adapter,does the laptop consume the battery even it is off?

    Yes, the laptop might consume some battery while being off but not that much. Losing 6% overnight is probably too much. Maybe your battery has to be replaced but I cannot tell for sure without testing the laptop with another battery.
    Do you actually turn off the laptop? If the laptop in sleep mode, this could be normal.

  7. 29
    Repair Man Says:

    @ Beth,

    I have a Toshiba Satellite P505-S8980. The locking tabs that hold the battery in place are broken. Is it possible to repair or have them repaired / replaced? I can’t find any info with Toshiba.

    Most likely these tabs are part of the laptop bottom cover.
    If tabs are broken, you’ll have to replace the laptop base cover.
    In some cases it’s possible to remove tabs from a new bottom cover and install on the original cover.
    Complete laptop disassembly required.

  8. 28
    Beth Says:

    I have a Toshiba Satellite P505-S8980. The locking tabs that hold the battery in place are broken. Is it possible to repair or have them repaired / replaced? I can’t find any info with Toshiba. Thank you!

  9. 27
    juan paulo Says:

    i have a hp g62 every time i turn it on the battery life left is only 94% but before i shut it down befor going to sleep it its fully charged because i use the ac adapter,does the laptop consume the battery even it is off?

  10. 26
    Ed Hand Says:

    I have a Dell Latitude C840. The locking tab that holds the battery in has broken. I have been told I need to find a damaged unit so I can use the parts. Any suggestions would appreciated.

    THANKS, ED

  11. 25
    Dave T Says:

    I own a toshiba p30. about a year ago, my laptop’s charging capabilities started to dwindle. Eventually my pc would shut off with the battery installed, not charging. I had to remove the battery to use the laptop. I thought it was my charger (it was literally falling apart, and I had to find another tip since the original broke. I spliced it into the charger, but it would still not charge.

    About a week ago, I finally got a new battery, popped it into the laptop…it still would not charge. I then ordered a new charger, which arrived today. I promptly plugged it in, and I was saddened that the battery charge light was still not going. I did some research on the net ( loose solder connection where the charger plugs into the laptop) etc…still nothing.

    then…I wondered…..the connectors on the battery AND the laptop are copper…..well..copper corrodes VERY easy. I took a sharp knife and scraped the copper leeds on the laptop where the battery makes contact, makeing sure I scraped every one. I popped the battery back in…and low and behold…the battery started to charge!!!!!

    I am leaving the pc off and plugged in overnight as I type this giving the new battery a full charge. Tomorrow I’ll put the old battery in and do the same.

    Now…all I need to do is figure out how to tighten the hinges. I have about 2 inches of play on the LCD screen….anyone offer suggestions on how to fix???

    Dave

  12. 24
    Luiz Rakkan Says:

    Using exclusion principle I can find out what in a motherboard can/could be blamed for draining the battery. The problem is to find some schema/spects of my motherboard and the test points. So, I guess, with a multimeter/voltimeter I can figure out who to blame. Thanks anyway.

  13. 23
    Repair Man Says:

    Luis Rakkan,
    There are many different components on the motherboard. I cannot tell which one is draining the battery.

  14. 22
    Luiz Rakkan Says:

    quote: “The battery is connected directly to the motherboard, and it drains the battery even when the laptop is off” , can you explain why and/or what in the motherboard uses the battery when the laptop is off, please? Thank you.

  15. 21
    Luiz Rakkan Says:

    Hi! First, Thank you for answered my question. I turned the power off, turned off the windows (and ubuntu) alerts when the battery is low to make sure that it goes to 0%, charged back (ubuntu shows that it’s 100% full and the designed energy that it can hold is the same (a little ABOVE) of the normal. So, I tested it again: got to work and took off the battery from the laptop. I’ve put it back and… 100% full. Now, after some couple of hours with it completely sure that linux is turned off (no leds on, no device attached to any USB ports, etc), the battery is at 97%. Changed the place of it, ambient temperature is ok (checked the manual), so, I’m really lost. Anyway, if you want/need more information to make some kind of “debug” of my machine I can send you some pics of the main battery place and the battery itself. If you don’t have time, I’ll understand, your site is very busy. Thank you again.

  16. 20
    Repair Man Says:

    Luiz Rakkan,

    when I turn off my laptop (trademark DATEN, AMD 64bits dual core athlon x2, 2GB RAM, etc.) and turn it on after, say, some four or five hours, my battery is only 90% to 95% charged. So, I make sure that when I shut it down (not stand by) the battery is 100% full charge. So, to make sure that it isn’t a battery issue/problem, I remove the battery and after some hours (and a week in the vacation) I put it back and… 100% charged! The question is: is any part/piece of a laptop that can be running even when I turn the laptop off?

    The battery is connected directly to the motherboard, and it drains the battery even when the laptop is off. It’s normal and happens with any laptop.
    Is it normal that your battery loses 10% of charge after 4-5 hours? Probably not. I guess the battery is getting old and doesn’t hold charge as it used to.
    Here’s what you can try. Charge the battery 100% and unplug the power adapter. Use the laptop as normal until the battery discharges to 0%. How much time does it take to drain the battery while using the laptop? If the battery doesn’t last for a long time, apparently it’s time to buy a new battery.

  17. 19
    Luiz Rakkan Says:

    (I’m sorry Repair Main, for this repost, I’ve typed this in the wrong place of the site, I’ll watch more this section of the site).

    Hello, may you can help me to figure out what is happening to my laptop battery. Before you lose interest in this message, I hope you read a bit more about my issue. Here is the thing: when I turn off my laptop (trademark DATEN, AMD 64bits dual core athlon x2, 2GB RAM, etc.) and turn it on after, say, some four or five hours, my battery is only 90% to 95% charged. So, I make sure that when I shut it down (not stand by) the battery is 100% full charge. So, to make sure that it isn’t a battery issue/problem, I remove the battery and after some hours (and a week in the vacation) I put it back and… 100% charged! The question is: is any part/piece of a laptop that can be running even when I turn the laptop off? It’s like some part, say, the wireless card still sucking my battery life or another part, I don’t know where more to go to solve it. I’m a coder/programmer and I never saw this behaviour before. If you wish to help me out, I can get more information from my Linux or Win32 OS to send it to you. What I’m sure is that the battery is ok and my Ubuntu says that the battery is ok, all cells ok, and it charge full! Hope my english was enough to you to understand me. Thank you in advance.

  18. 18
    Repair Man Says:

    William,

    There battery was dead so I bought a replacement off of ebay for about $35. The battery works fine and charges fine, but when it reaches 100, “sometimes” the laptop starts using the battery and drops the power adpater and will sometimes flip back and fourth between the battery and the power.

    Does it happen only when battery charge reaches 100%?

    I thought at first I may have a bad dc jack that was shorting or something, but that doesn’t seem to be the case because the laptop runs fine on ext power.

    Here’s what you can try. Turn off the laptop, remove the battery and start the laptop from AC power.
    Now wiggle the power plug inside the jack. If the laptop shuts down, it’s either bad jack or there is a short inside the power cord.

  19. 17
    William Says:

    I have a presario 2100 I am working on for someone. There battery was dead so I bought a replacement off of ebay for about $35. The battery works fine and charges fine, but when it reaches 100, “sometimes” the laptop starts using the battery and drops the power adpater and will sometimes flip back and fourth between the battery and the power. I thought at first I may have a bad dc jack that was shorting or something, but that doesn’t seem to be the case because the laptop runs fine on ext power. Could it be this cheap battery (which I noticed doesn’t have a UL sticker on it) causing problems? Could it be with the new battery, it is putting a load on the DC jack and shorting it?

    Thanks

  20. 16
    Repair Man Says:

    amit,

    how to find out whichis the +’- trminal of battry supply plz help me

    All batteries are different. You’ll have to use a voltmeter to find it out.

  21. 15
    amit Says:

    how to find out whichis the +’- trminal of battry supply plz help me

  22. 14
    Repair Man Says:

    Makadauan,

    I can’t switch on my laptop if not connected to the adopter even if my battery is fully charge. the moment i connect with the adopter, i can switch the power on. what’s the problem with my laptop?

    It’s hard to tell without further investigation.
    1. It’s possible the battery is defective even though it appears to be 100% charged and the laptop cannot start from the battery.
    2. There could be a problem with the motherboard.

    The only way to find out which one is causing the problem is testing the laptop with another known good battery. If the laptop still fails to start, you have a problem with the motherboard.

  23. 13
    Makabayan Says:

    This is my problem with my laptop, I can’t switch on my laptop if not connected to the adopter even if my battery is fully charge. the moment i connect with the adopter, i can switch the power on. what’s the problem with my laptop? thanks

  24. 12
    Repair Man Says:

    Grace,

    when i unplug the power cord, the battery is detected the laptop works fine for a few minutes and when the discharging level reaches 95%, the laptop turns off immediately

    I think you have a bad/faulty battery and it has to be replaced. Just my $0.02

  25. 11
    hazel Says:

    sorry for the late reply Mr. Repair Man. Anyway, the other flash drives are already functional in other computers. Even memory card reader here in the Phils are not readable by the laptop. It just requires drivers when being inserted by other devices. Do I really have to have drivers for every device that I am going to use? This really bothers me since I have tried inserting my flashdrive to other PC without drivers and it worked.

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