Quantcast How to discharge and charge laptop battery?

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  1. #1
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    Default How to discharge and charge laptop battery?

    Some Customer had purchased new Laptop battery ,but doesn't know how to discharge and charge laptop batttery.Now i will answer this question,thanks!

    A typical charge and discharge cycle is as follow:
    1. Install your newly purchased battery into your laptop
    2. Disconnect the AC adapter and use your laptop until it itself shuts down. In this situation, the battery is fully discharged.
    3. Connect the AC adapter and your battery should start charging.
    4. Charge until the battery is full.
    Repeat this charge and discharge cycle a few times and your battery pack will be conditioned to perform at full capacity.

    Note: Please do not overdischarge and overcharge your battery.

  2. #2
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    Default Re: How to discharge and charge laptop battery?

    Why would you want to deliberately run a Lithium battery all the way down? That's just asking for trouble. If your laptop has any kind of Li battery, you don't ned to 'condition' it.
    First PC = Vic-20, 8" 128KB Home-Brew Floppy Drive ... Current Rig = eMachines m6805 ... Quantum Leap?

  3. #3
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    Default Re: How to discharge and charge laptop battery?

    i believe a full discharge once a month helps keep the calibration correct. there's nothing wrong with it. ive noticed my batt meter going from 4:25 (inaccurate) to 4:00 (accurate) after a full discharge.

    to add on to what good battery said, the safest way to perform a FULL discharge is using ur laptop until batt gets down to 10%. Then reboot, and leave the computer on at the BIOS screen. Let it drain to 0% and die from the BIOS.

  4. #4
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    Default Re: How to discharge and charge laptop battery?

    Are you sure it is a good idea to completely discharge it? Last time I did that my wear level went from 4% to 6%, then I completely discharged again then it went from 6% to 9%

  5. #5
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    Default Re: How to discharge and charge laptop battery?

    Full discharges are not good for Li-Ion batteries. Partial discharges cause less capacity loss over time.

    I believe goodbattery is discussing the care of older battery types.

    Read more on the topic in the battery guide.
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  6. #6
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    Default Re: How to discharge and charge laptop battery?

    On NiMh and NiCd batteries, this is a good thing to do, but on LiIon, LiPoly, LiMg, LiMn it is very bad. It adds wear and the battery could over discharge and ruin the cells. On the older batteries, like NiMh and NiCd the cells will die unless they are cycled. NiCd needed to be discharged before you could recharge them or they would develop a "memory" and would never charge to full again over time. NiMh got rid of this problem, but you did not want to store them with more then a charge of .9v per cell, or they would degrade over time. NiCd should have been put to a <.9v charge to store them. But as seeing how neither NiCd or NiMh are being used in todays notebooks, it is not something that anyone should really need to know, but just in case anyone wanted to know.
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  7. #7
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    Default Re: How to discharge and charge laptop battery?

    I agree with Chris and Nicolas... if you got recent laptops that use li-ion, there is no need to do frequent discharge/recharge, you are only killing the battery. I did that for my old Sony laptop and the battery was useless within 3 months.

  8. #8
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    Default Re: How to discharge and charge laptop battery?

    Exactly what I said. And if you look at the OP's Sig, is it any surprise that he just happens to sell batteries?
    First PC = Vic-20, 8" 128KB Home-Brew Floppy Drive ... Current Rig = eMachines m6805 ... Quantum Leap?

  9. #9
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    Default Re: How to discharge and charge laptop battery?

    Quote Originally Posted by TehStranger View Post
    I agree with Chris and Nicolas... if you got recent laptops that use li-ion, there is no need to do frequent discharge/recharge, you are only killing the battery. I did that for my old Sony laptop and the battery was useless within 3 months.
    Well, I'm glad I read this thead. And TehStranger, your comment about Sony makes me wonder what the heck is going on.

    Check out this update utility for my notebook on the Sony site.

    Sony Power Management Settings Utility

    This utility allows you to temporarily disable power management and the low battery alarm on your VAIOŽ notebook to enable a complete battery discharge. Once the battery discharge is complete, fully recharging the battery will ensure maximum battery performance.
    This is a Vaio bx560b similar to the one in this very nice review:

    Sony VAIO BX540 Review (pics, specs)

    It has a Li-ion battery.

    I guess they practice the theory, "What doesn't make me explode, makes me stronger."

  10. #10
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    Default Re: How to discharge and charge laptop battery?

    Hey all,
    RC planes are my life, and I (like countless others) use lithium polymer batteries to power them. They are essentially the same as notebook packs- I noticed that my S96Js pack said 11.1V, exactly what I like to use to drive my planes. Only difference is, my packs (depending on which one) can deliver anywhere from 1A to 80+A..!
    Anyyyyway-> In no way do you EVER want to run a lithium cell below ~3 volts. I've seen packs puff up, and they are prone to exploding. Lithium fires are NOT fun. Nor do you have to condition lithium cells, they don't really have a memory like nickel-based products. Hell, I can charge a pack, leave it on the shelf for a year and it'll only take a tiny top-up to go fly!
    To make a long, off-topic post short- just because you're not discharging your laptop battery at currents that could cook a whale doesn't mean it isn't dangerous. DON'T cycle them, no reason to and the average numpty will probably discharge his cells too far- the next time he charges, they might just go BOOM!

 

 
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