Find solution
How do i know if my cell phone battery is completely fried?

I would like to know how to charge a 3.7v cell phone battery with a usb cord.?

  • I have a cell phone battery at 3.7v. I belive a usb output on a laptop is no more then 5v. I need to charge the cell phone battery with the usb cord but i need to do it safely. I need to make sure the battery will not over heat, but that it charges normal. This is a project for school I am not tech savy please include links to any parts that i may need or describe them the best you can thank you so much.

  • Answer:

    Not sure there is such a thing. Way I do it is to put in the cell phone and use the charger for the phone. Problem is that li-ion batteries, as used in cell phones, need sensors built in to the battery. Be difficult to build a universal charger for every size cell and variation in the sensor. As usual, the cost tradeoffs would most likely make such a device uneconomical to produce which is most likely why we don't see them around.

vinnytool at Yahoo! Answers Visit the source

Was this solution helpful to you?

Other answers

Not sure there is such a thing. Way I do it is to put in the cell phone and use the charger for the phone. Problem is that li-ion batteries, as used in cell phones, need sensors built in to the battery. Be difficult to build a universal charger for every size cell and variation in the sensor. As usual, the cost tradeoffs would most likely make such a device uneconomical to produce which is most likely why we don't see them around.

Numbat

Related Q & A:

Just Added Q & A:

Find solution

For every problem there is a solution! Proved by Solucija.

  • Got an issue and looking for advice?

  • Ask Solucija to search every corner of the Web for help.

  • Get workable solutions and helpful tips in a moment.

Just ask Solucija about an issue you face and immediately get a list of ready solutions, answers and tips from other Internet users. We always provide the most suitable and complete answer to your question at the top, along with a few good alternatives below.