hi, i struggle to make a power bank. I bought a dc booster module and i step up from 3.7 volt to 5.09 volt, i use a lion battery. While i can charge android phones, cant charge iphone. Iphone takes 100ma and it doesnt turn to charge mode. Is there any charge mode data on usb? Why cant i do this?

 

Because you need to use the Data pins to tell the phone to charge...

 

Because you need to use the Data pins to tell the phone to charge...


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İt is amazing thank yoouuuu

 

Different devices require different voltages on the data pins. If you search around, you can find databases of voltages that people have found to work for different devices. As you've noticed, some devices don't care.

 

Different devices require different voltages on the data pins. If you search around, you can find databases of voltages that people have found to work for different devices. As you've noticed, some devices don't care.

How power banks work for all phones if there are different data?

 

when it comes to apple products, they often don't. <muttering to myself, I won't bash apple, I won't bash apple, I won't bash apple...>

 

How power banks work for all phones if there are different data?

Simple answer - they don't. And it's not just Apple. See here, for instance. Or here.
More:
https://learn.adafruit.com/minty-boost/icharging

 

Simple answer - they don't. And it's not just Apple. See here, for instance. Or here.
More:
https://learn.adafruit.com/minty-boost/icharging

So with 2v for d+ and d- , i can charge all phones with low power (500ma) . Am i wrong?

 

So with 2v for d+ and d- , i can charge all phones with low power (500ma) . Am i wrong?

I don't think it's that simple but I don't know for sure. See what those various references have to say.

 

I think it's not that simple. I have a 2-port charger. The retailer knew nothing. The manual knows nothing.

I found out that one side doesn't charge my cell. It was labeled a 2.1 Amp charger.

I could charge my cell on one port at 500 mA and the GPS in the other at 1A, but the cell would not charge on the 1 Amp port.

So, I labeled the ports and the unit. USB-2, 1.5 A and 0.5 A. Probably should label them Phone and GPS too.

I believe it customary to be able to supply 100 mA without negotiation.

You might try a dedicated charging port controller such as http://www.ti.com/lit/ds/symlink/tps2511.pdf. This one does support a 0.5 and 1.5 A standard, but my charger would not support 0.5 A on both ports.