Laptop Batteries - Fantasy and Reality

Published on March 02, 2012

Laptop Batteries - Fantasy and Reality

    5 years ago, we started selling laptop batteries.
    Then we had little idea of ​​what problems of Chinese architecture we would encounter.

    I want to tell you what you should pay attention to when buying a battery for a laptop, and indeed batteries for mobile devices.


    An article about laptop power supplies is here.
    A standard laptop battery is made of lithium cells, for example, these are:


    The main brain of the battery is the controller:


    What problems are there with lithium cells and how does this affect the battery performance:

    1. Cheap cells, sometimes cells that have already been used clearly come across, it was possible to find out after analysis batteries that were just returned after 2-3 months under warranty.
    Solder marks were visible on the element. It is soldering, which is not permissible in the factory manufacture of batteries.
    The problem here is that lithium batteries are very sensitive to elevated temperatures. Soldering of such elements is permissible, but very short-term and without overheating of the element.
    The usual way to connect lithium cells is spot welding, when the cells are connected by conductive plates through spot welding, which is very reliable and most importantly quickly and without overheating the cell connects them together.

    Several times I came across batteries, which, due to cheap lithium cells, could melt after 2-4 months of storage in a warehouse, fortunately we did not reach the fire).
    This happens again due to the fact that the elements are of poor quality, and when a closure occurs, most likely, lithium plates inside the element or the protection against closure that should be on each element does not work. It looked awful, plasticized battery batteries, almost completely molten body.

    2. The problem of the electronics of the battery - controller.
    Since lithium cells are charged in a special mode, a charge controller is built into the battery.
    This controller allows you to control the charge process for more efficient use of batteries.
    I won’t go into the intricacies of charging, I will say that this affects the battery life, the working capacity and its level during operation.
    The main problems that may be with the controller:

    - incompatibility with the laptop, it often happens that the battery model exactly matches the laptop part number, but the battery contains a changed, newer, older controller. As a result, we have a dead battery.

    - Some manufacturers, such as Sony, make the battery protection at the controller level from fakes. They do this so that it is impossible to use batteries that were not manufactured at official Sony factories. But the Chinese people), figured out how to get around this. With such left-handed batteries, a program is included that must be started before the battery is installed, as a rule, and it will remove this lock from the manufacturer.

    - it happens when small, nimble Chinese pens simply stupidly mix up wires when connecting the controller, and here it’s just no comment ... It can end all by simply not being able to charge the battery, or breaking the laptop. There was a case when the plus and minus of the batteries were already mixed up at the output.

    - a problem with the firmware of the controller itself. Since we had a battery tester, we could see additional information about the battery. Which was wired in the controller (for example, the date of production of the battery, current capacity, the number of charge-discharge cycles, voltage on the cells and a bunch of other technical information). Honestly, most of this information can be changed, it is enough to collect a simple controller that works on the LPT port. It so happened that information on the date of manufacture of the battery was indicated by a future date, for example, six months in advance. They probably do this in order to sell batteries that are long gone. By the way, if the lithium battery is stored for a long time, and the minimum charge that the controller always leaves to store the battery at zero, then the cell simply dies, such cells can be reanimated,

    What you should pay attention to when buying a laptop battery:
    - the quality of the battery, its appearance, the quality of the plastic, the quality of the stickers and their readability on the battery.
    - if possible, always come with your laptop and power supply and check if the purchased battery is working, charging and discharging.
    - if you have a problem laptop where only original batteries work, then take only the original, otherwise you will dance with a tambourine or throw out a cheaper fake in the trash after a few months.
    - China now produces all the elements for laptop batteries, and you do not need to buy what you will be told about the elements manufactured in South Korea and Japan, as a rule, the seller argues that the price of the battery is too high. Yes, there are elements that are produced in South Korea at LG factories, but the percentage that they will be in the battery that is bought to replace a new one is 5%. About 100-150 batteries passed through my hands, which I disassembled and threw away due to a breakdown and never did the elements produced in these countries, except China, get into it. Only once did such a miracle happen when the buyer himself gave away the battery that came with the laptop when it was sold.

    On this, I ask permission to unsubscribe if the review was interesting, I can draw up a more serious review about charging problems, problems of returning such batteries under warranty,
    and, the topic of power supplies)) this is a completely different topic where Chinese manufacturers simply shine with fiction and creativity of the approach)) )