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Can I use 12 W iPad charger for iPhone 7?

Tartarus

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Feb 20, 2014
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Is it safe or it will harm the battery life of iPhone 7. On 12 w charger it is written output voltage is 5.1 V i think the iPhone needs only 5 V.

Why do you think that?

Anyway, there is no harm in using an iPad charger on any iPhone.
Even Apple’s website says so.
 

SupNorm

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Feb 2, 2018
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At our house we have been only using 10W and 12W iPad chargers for our iPhones.

Tip: when using third party cables make sure they support 12W charging (often marked as 2.4A). Otherwise, the cord is going to be a bottleneck throttling charging speed down. Also, don't buy cables longer than 1m (3.3ft), longer cables charge slower.