What's the voltage input needed to run and charge the iPad 4?

What's the voltage input needed to run and charge the iPad 4?

As long as the charger is rated for at least 10 watts or 2 amps it well charge the iPad just fine. A higher rated charger such as the 12 watt 2.4 amp charger will also charge the iPad, possibly a little faster, but it will not damage it. Chargers rated at 5 watts or 1 amp may charge an iPad very slowly if not at all.
Just be aware some cheaper dual port USB chargers share the 2 amps. It will charge an iPad in one port but adding another will reduce the current to both ports to 1 amp. An iPhone may charge fine but the power would be reduced to the lower level and slow an iPad charging on the other port. The one you link to will work fine although it looks as though one port is 5 watt/1 amp and the other is 10 watt/2 amp. There are many adapter's available that will supply 10 or 12 watts to both ports to future proof the charger giving you the capability to charge 2 iPads or other more demanding smart phones with larger batteries. I like Scosche reVolt chargers, they cost a little more but they are a quality product. If you want the best option go with a 12 watt charger which can speed up charging on many products a little more than a 10 watt can.

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