Home Made SmartPhone PowerBank

[Ravindu Prabash]

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?

 

[Harald Kapp]

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.

Is it possible and effective?

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]

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.

ThankYou