How to Replace Old Computer Batteries

Tried of replacing your batteries every 2 years for you laptop?
Now you can change your batteries in your laptop so you will not have to spend $100 on a new battery

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1: Start

Disconnect the battery from your laptop. There will be 2 tabs on each side of the battery, just slide them to the side and pull it out.

Step 2: Take Apart

Pry the battery apart. You may also need some patience and a sharp flathead screwdriver or a butter/putty knife.

Step 3: Tracing Wires

You will see 6-8 cells connected to a circuit board. That is the battery controller. Look near the connector to find the board, and trace the wires. Carefully examine every cells by a multimeter to ensure the cells are fully discharged.

Make a note of where the wires connect to. This is important because if you forget to place the wires in the correct place the battery may destroy your computer.

Step 4: Electrical

Use a soldering iron/electric welding tool to separate cells from the wires. Then take them out of the case

Then solder/weld the new cells together. Remember to refer back to the note you made in Step 3.

Put the new cells into the case. Solder/weld back the wires and cells.

In the end put both rows of cells back together. Let it rest for about 48 hours.

Step 5: Finished

Now you are DONE!! Insert your battery and start charging. Turn it on, and you're ready to turn on your computer!!!

Be the First to Share


    • Instrument Contest

      Instrument Contest
    • Make it Glow Contest

      Make it Glow Contest
    • STEM Contest

      STEM Contest

    6 Discussions


    5 years ago

    In two cases I found that whereas the cells themselves were still good but the controller was kaput. From what I've read, some manufacturers (shame on you Sony, Dell) actually have the controllers blow an internal "fuse" after N battery cycles. Your mileage may vary.

    1 reply

    Reply 5 years ago on Introduction

    It's entirely possible that they know that the batteries no longer charge well and/or are subject to catastrophic failure or heating beyond a certain point and that this "fuse" you refer to is actually a safety feature, not a way to make you buy a new battery solely for their profit. -- Just because the cells still don't measure as 0 volts or some cuh doesn't necessarily mean that they're still good.(


    5 years ago on Introduction

    Hi there,

    One thing that confused me a little, why do you say: Let it rest for about 48 hours?



    1 reply

    Oh, for my battery I had to glue it back together so That is why you should wait 2 days for the glue to dry. I always take my projects slowly since I want good results.


    5 years ago on Introduction

    Any tips on what kind of cells should be used? I bought a replacement unit on-line and it was pretty poor, maybe had poor cells in it..?

    1 reply
    Chuck Brown 14stechi

    Reply 5 years ago on Introduction

    If that replacement unit can be returned you will want to contact them as soon as possible and see if you can replace it again. There are many things that could have gone wrong. It could be the connections between the cells or, like you said, bad cells.
    If you want to replace the cells then you will have to find the battery cells that are the same as the ones that the company recommend.
    But once you open the battery you will no longer be able to send it back to the computer company to have it replaced!!