Can I use both ports to charge devices, or I have to use one or the other one at a time?
626696
You have to use one port per time, those two ports are for different speed.
626697
You can use both ports ... I have had 2 phones charging before at the same time
410585
Considering the 2.1 A current limit coming from both ports, I would say that while you could charge 2 ipads simultaneously, they would probably take a while to charge up. It would be faster to charge 1 then the other, or charge 1 via USB and the other via the AC socket and the OEM charger.
1498583
The charger has two usb ports, a usb2 and a usb. I see no reason you should not be able to charge two at once though I have an iPhone 4. That charges quite quickly.
876142
You should be able to for either and both together, just remember to have your vehicle running as trying to charge two devices at once can drain your vehicle battery down. This is just an extension of your 12 volt outlet.
984266
As far as I can tell, both ports are the same. We don't have an iPad, but we charged two phones at the same time and both charged. We also charged a Kindle and an Android tablet with no problems.
2043903
I'm actually using a spare one for that function now. HOWEVER, it will only charge items at the USB limit of 500mA per port. Most true chargers are capable of 700mA to 1000mA depending on the device.
683582
Yes you can charger two Apple products at the same time. It is however slower to charge both..it cuts the amount of power is my understanding. I am currenting using this charger as I type, and even though only had a short time, am pleased with it.
2211420
You need to plug both in because one transfers data and the other supplies power. If you can only connect one then you need a usb splitter.
2030499
most certainly! I have had two devices charging at the same time with no problem. Certainly one item charges faster but all in all the charger is real quick on recharges and you shouldn't have a problem good luck!
1043446
You can charge both at the same time, but its better if you do it separately
2167499
Yes it can do both simultaneously. You can charge multiple devices and plug this power bank cable into AC outlet for charging the device itself.
1948111
You can use either one, also the 2nd one can be used to extend power to another device.
581461
Yes, it can be used to charge two Android devices at once. My understanding is that the apple port only charges an Android device at 1.5A, but the Apple device at 2.1A. It charges my S3 pretty darn quick though.
2207102
It will work just fine for either one. The only thing you MAY notice is that, if charging both devices at the same time, the charger might run a little bit on the warm (not hot) side but I don't think so. Regardless, it shouldn't be a problem.
789304
This is what this device is designed for - 2 USB ports give extra power to 1 device.
1543141
This device has only a output port, so in theory, you only can power feed a single device at time, However, if the sum of all loads doesn't exceed the capacity of the power bank, might be possible to feed more than a device with some sort of divider cable, but I'm not sure if that device exist in the market. If you are handy with a soldering iron and have some electronics knowledge, this should be easy to solve. Good Luck!
2031815
It have to be one or the other because it only have one port but I have never tried that configuration that your reffering to