Will a 12W charger shorten the battery lifespan?

Hi all,

I’ve just got a new iPhone 7 and while I am loving the transfer from Android, the battery backup and charging time are irksome.

I looked around some and realised that 12W chargers work much better than the 5W one supplied with the phone.

So I was planning to get the Anker 12W charger -

instead of the more expensive but not necessarily better quality iPad one.

However, I wonder if there may not be a method in the madness in the decision to supply a 5W charger? Does this not ensure a much longer lifespan of the battery, especially since a lot of users keep their iPhones for more than 3 years. Or are there other reasons such as cost for this decision?

So I am wondering if I may end up negatively effecting the lifespan of the phone’s battery by shifting to a 12W charger?


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In theory yes.

There are long, long and too long discussions about this so I will not do that and simply answer yes. Faster charging can impact battery lifespan so that's a given. For Apple, I'd stick with Apple's own chargers if you want to stay inside their often protective system.

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But how much of a difference will it make?

A couple of months? More than 6 months shaved off of the lifespan?
And when you recommend confining myself to Apple, do you mean to endorse using the iPad charger?
Will it less adversely affect the battery than other brands chargers?

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No one can answer. but why?

Because the lifespan is set by cycles and heat, no one knows what the loss will be.

Your top question was an easy one. This one is not. There are studies on life span so you can see what affects life span but per cent would demand you know all the conditions. Not just this new charger alone.

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Example article.

" Simple Guidelines Regarding Chargers

- If possible, charge at a moderate rate. Ultra-fast charging always causes stress.
- Fast and ultra-fast charge fills the battery only partially; a slower saturation charge completes the charge. Unlike lead acid, Li-ion does not need the saturation charge but the capacity will be a bit lower.
- Do not apply fast charge when the battery is cold or hot. Only charge at moderate temperatures. Avoid fast charging an aged or low-performing battery."
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Battery life span

I have performed an experience in the past and charged my ophone with a high voltage charges and what i noticed is as quickly i my phone's battery was charged, so it was discharged. So yes using high voltage charger badly affect your battery and i would suggest you to stick to the genuine charger that apple provides you.

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Yes, 3rd party alternatives will

Thanks, this is not surprising if one uses non-Apple certified 3rd party alternatives.

I checked out my friend's Anker (12 W per port) charger that uses what they call IQ - basically adjusting the charging current depending on the phone model.

I charged my phone only once and was expecting it to heat up much more than with the 5 W charger. But I was surprised to see that it was at the same or even a little lower temperature than when it is charged with the standard 5 W charger.

I also noticed that the charging time (I always charge on Flight Mode) was better - but not by much. Say 15% or so. Which could mean that the IQ system of the Anker works with the iPhone to not charge at a too fast current, or that for some reason the iPhone will only let the Anker charge at a not very high current. This is of course different from when you use the iPad charger that I hear charges at a much higher current (and likely negatively affects the battery lifespan as pointed out by members here).

Any thoughts?

Post was last edited on July 3, 2018 12:14 AM PDT

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Did you use Anker or some other 3rd party adapter?

I borrowed a friend's Anker 24 W (12 W per port and 2.4 A max per port) adapter and using the standard iPhone cable got interesting results.

It charged my phone (I follow the 50-80% cycle) faster (by roughly 15%) than the 5 W standard adapter. There was noticeable heating, and in fact both the charger and phone felt a little less hot than with the standard charger.

This Anker adapter uses IQ technology (not the Qualcomm fast charge) that lets it adapt to individual phone charging rates.

So even though it could have given out as high a current as the iPad charger, it obviously charged much slower. But overall a quite satisfactory experience. If I get the chance I'll also check from 20 to 100%.

Any thoughts?

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