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Power bank questions

Former Member
Former Member over 10 years ago

I'm going on holiday soon and came up with an idea, I found an old laptop battery which was 10.8w and 4400mah in total there was 6 batteries inside meaning I divide the total mah by 6? which would make the 733 each? or should it be 4400mah in each one? I'm not 100% certain. Anyway since the battery holder/pack is destoryed I have no way to charge them. I was wondering if I wired them in series and added a wire to the positive in the start of the circuit and the negative at the end and wired it to a DC OUT connector would I be able to charge them like this? if so, How would I find out which charger to use? the original one from the laptop is missing that's why I used these ones. Since I'm taking it on a camping trip I was also wondering if there was a possibility to add a winding function to also charge the battery meaning if I'm that desperate I could power it and install a little voltage monitor?

 

 

I don't know much about batteries or electronics but I'd like this to be my first little project as I need a slightly portable phone charger and I'd like to use what I own to make one instead of purchasing a made one. I know there's a lot of features but I'd love to make something all in one that'll last me a life time, I did question solar power too but personally I feel it would charge too slow. although it might be feasible in the later future.

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  • shabaz
    shabaz over 10 years ago +3
    There is an easy-to-read overview of Li-Ion and Li-Po cells and batteries but by the end of it hopefully you'll see that using a laptop battery is a non-trivial task and extremely dangerous to charge unless…
  • balearicdynamics
    balearicdynamics over 10 years ago in reply to shabaz +1
    Hi shabaz. I agree with this assumption (not only a warning but including the useful information you add). But as screamingtiger can confirm, I think as he is a great aeromodelist, it is years I see RC…
  • screamingtiger
    screamingtiger over 10 years ago +1
    A 6 cell battery is already wired in series. So each cell is 4400mAh and the voltages of each cell are added together. You will also need a MCU of some sort to properly charge the battery and cut off once…
Parents
  • screamingtiger
    screamingtiger over 10 years ago

    A 6 cell battery is already wired in series.  So each cell is 4400mAh and the voltages of each cell are added together.

    You will also need a MCU of some sort to properly charge the battery and cut off once charged.

     

    As is stated, you can use the battery unmodified and I would not take it apart.  As was stated, this is dangerous on many levels.

     

    If you want to build a portable charger, then all you need to do is put 5V into the cell phone and it will charge itself using its own MCU based charger.

     

    Simply take a USB cord, cut it.  Find the +/- wires, and connect that to a 5V source.  The simplest source of course are 3AA batteries in series.

     

    I am power my raspberry pi this way, with a modified USB cord.  In my case I am using a LIFE pack.

     

     

    Find yourself a good 5V battery or put a regulator on one, and modify a usb cord!  A lap top battery may be harder to use but if you don't have a charger you will need to purchase one.  So you might was well just purchase a portable cell charger.

     

    Your biggest risk here is taking that battery apart or charging to charge it in some hacked up way.  Please do not do either.

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  • screamingtiger
    screamingtiger over 10 years ago

    A 6 cell battery is already wired in series.  So each cell is 4400mAh and the voltages of each cell are added together.

    You will also need a MCU of some sort to properly charge the battery and cut off once charged.

     

    As is stated, you can use the battery unmodified and I would not take it apart.  As was stated, this is dangerous on many levels.

     

    If you want to build a portable charger, then all you need to do is put 5V into the cell phone and it will charge itself using its own MCU based charger.

     

    Simply take a USB cord, cut it.  Find the +/- wires, and connect that to a 5V source.  The simplest source of course are 3AA batteries in series.

     

    I am power my raspberry pi this way, with a modified USB cord.  In my case I am using a LIFE pack.

     

     

    Find yourself a good 5V battery or put a regulator on one, and modify a usb cord!  A lap top battery may be harder to use but if you don't have a charger you will need to purchase one.  So you might was well just purchase a portable cell charger.

     

    Your biggest risk here is taking that battery apart or charging to charge it in some hacked up way.  Please do not do either.

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