Is it OK to charge iPhone with 2A?

That just means your phone can pull up to 2A, if it is capable of using it. Older phones that can't take the full 2A will pull as much as they can, even off the 2A charger. It's a maximum capability, not what is force fed to the device. Yes, it's fine.



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Check the Voltage and Current Output On the other hand, anything below 1000mAh is considered a slow charger. So look for 5V-2A or 5V-2000mA. Ideally, you should seek out a fast-charging cable of 2A voltage or more, but double-check the specific current suitable to fast charge your personal device.

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2A will charge the phone faster because it's higher current. Though with higher current you need thicker cable - it's lower resistance, thus all that current will go through nicely. Higher current = battery heat.

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If you will be monitoring the charge actively, you can punch up the 10A rate. If you will be walking away from it for hours or days, select 2A and that will better approximate the trickle charging it should get when full, so you will do less damage.

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smartphones takes only the power it needs or handles upto. so you wont see any difference between 3A charger and 2A charger if your phone can support upto 5V 2A charging. But if your phone can take 3A of higher, You will find 3A charger faster than 2A charger As it takes more power available to charge the battery.

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2A is the amount of amperage that is suggested to recharge the battery. This dose not mean that a transformer of lesser amperage won't charge it it would just take longe. Think of amperage as a pipe the larger than amperage the bigger the pipe.

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