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Home Made SmartPhone PowerBank

Discussion in 'General Electronics Discussion' started by Ravindu Prabash, Feb 2, 2017.

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  1. Ravindu Prabash

    Ravindu Prabash

    Feb 2, 2017
    I want to make a powerbank using a 7.2V 2500mAh rechargeable battery pack to charge my HUAWEI smartphone with 2000mAh 3.8V battery.Is it possible and effective? and How?
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    You can find a lot of information searching for "build your own power bank" on the internet.

    The gist of it is that your power bank needs to have a voltage regulator to create a 5V output on a USB port. You can then use the standard USB charge cable to charge your smartphone.
    You will also need a charge controller to be able to charge the batttery pack within your power bank from e.g. a mains power source.
    Possible? Yes, see above.
    Effective? Yes, if you use a switch mode voltage regulator. A linear regulator could be used here, too, but with less efficiency.
    Ravindu Prabash likes this.
  3. Ravindu Prabash

    Ravindu Prabash

    Feb 2, 2017
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