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Weird problen charging apple devices
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nvidia:
So i found my ipod touch not used in a couple of months  plugged it in to charge via a non apple power brick held down power button it showed the battery and lighting bolt for 3sec and went away left it for 5hrs but it wont turn on thought maybe the cable was broken so tried it with my ipod nano 3rd gen it woud not charge and my fake ipod nano also would not charge got another cable also would not charge tried a couple power bricks with no luck so tried the usb slot on my pc and both the fake and real ipod nano charge fine

What could cause this as charging my ipod touch via pc would take forever due to being  low mA
james_s:
IIRC Apple chargers have a resistor in the charger connected to the USB data pins that tells the device the capabilities of the charger. Aftermarket chargers may not have this.
kripton2035:
the default charge current of these devices is 500mA. if you install the correct resistors between the data pins, you can force 1A or 2A or current.
anyway if it charges with the PC, it should charge also at the lowest current, with the aftermarket chargers.
you should try independently the charger(s) tha cables, the devices. also a small usb current testing device is usefull to have.
tooki:

--- Quote from: james_s on April 20, 2021, 05:17:27 am ---IIRC Apple chargers have a resistor in the charger connected to the USB data pins that tells the device the capabilities of the charger. Aftermarket chargers may not have this.

--- End quote ---
Almost any Apple product that uses USB charging will charge on a third party charger that has the industry-standard shorted data pins to indicate 500mA charging capability.

One possibility is that the charger is using resistors or an IC to claim a current higher than it can deliver, and then either shutting down under the load, or the voltage sagging enough that the device stops charging.

Finally, when the batteries are extremely low, the initial charge current is kept low (100mA I think? Not sure, it’s been a while since I tested this.) until the device can power up and control charging via the CPU. Perhaps the charger shuts down under the low load?

Anyhow, given that the devices all charge fine on the computer, the problem is almost certainly a defective charger. I strongly advise against using cheap chargers due to safety concerns, so I’d buy a name brand charger (Apple, Anker, Belkin, etc) and destroy the old one. 
Ed.Kloonk:

--- Quote from: tooki on April 22, 2021, 05:46:30 am ---
Anyhow, given that the devices all charge fine on the computer, the problem is almost certainly a defective charger. I strongly advise against using cheap chargers due to safety concerns, so I’d buy a name brand charger (Apple, Anker, Belkin, etc) and destroy the old one. 

--- End quote ---

Srs question. Are the name brand ones really safe, though?

I've understood that all these things come out of the same factories. With regard to transformer insulation and HV clearances, some are better than others. Can we rely on Apple and Samsung, name branded (and genuine) USB chargers being safe just on brand name alone?

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