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Can dumb / feature phone be charged using USB? Answered

Hello,
I recently received a USB power pack but I can't seem to charge the dumb / feature phones that I have.  When I use this adapter to connect the phones they say that they are charging but even after 5 hours they seem like they didn't get a charge t all.

Is the voltage difference the issue? With the USB being 5V and the phone battery being 3.7V (though the output of the chargers that the phones came with is 5V).

Could I have a faulty unit?

Thanks for reading.

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Kiteman
Kiteman

6 years ago

I have similar issues with some devices, even if I am just using the "wrong" mains charger.

I believe (no evidence) that it is an issue of current as well - charging effectiveness is a function of both voltage and current.

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Full Metal
Full Metal

Reply 6 years ago

I'm trying to find out what the mA rating of the USB port is but the wall outlet phone charger is 5V 400mA so if the USB port is providing less amps than that it won't charge properly?

Also, because the battery in the power pack as well as the batteries in all the phones is 3.7V what would happen if I remove the USB port and wired that 10 in 1 adapter directly to the battery?

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Kiteman
Kiteman

Reply 6 years ago

You ought to check your phone's manual to see what it needs for charging (or see the output of the supplied charger).

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Full Metal
Full Metal

Reply 6 years ago

I got the 5V 400mA figures from the charger which came with the phone.

If the USB port on the power pack supplies less than what I mentioned above, the phone won't charge properly?

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Kiteman
Kiteman

Reply 6 years ago

Yes, that will be the case.