Age old question, how to charge smartphone

Hello everyone
So here is a really old and repeated question onec again

As people are staying more at home and using smartphones more and more
Here again we get to the point of what is the best way of charging them
A-charging cycles shouldn’t be full to empty on Li batteries and
B-it is not that important how long would the battery last compare it to the smartphone life span
But as charging station is available more at home
Now what is the best recommendation for charging

Is it better to use up to 40% then charge it up?
Use to 90% then charge it?
Doesn’t matter just put it on charger whenever you’re not using it?
Leave it in charger and use it all the time?

What would be your recommendation

SafeNsound=safe inside

I have never really got to the bottom of this over the years and the battery chemistry changes and I have to start again… With so many conflicting reports and corrections years later.

But here is a start:

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I never really worried about it to be honest. I just let it run down and charge it at night whatever the charge level is at. When I was working at the office, it would depend on how much charge is left after lunchtime (I use my phone a lot at work for music etc) and put it on the wireless charger if I don’t think it’ll make it until I get home.

I think the battery management is good enough these days to not worry about it too much.


You’ll never find a real answer. There have been in-depth studies that come up with totally opposite results.

I tell people not to think about it. Nobody needs one more thing to worry about.

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I agree
In the past many years i always full cycled my batteries
I still have a sony erricson w phone with pretty good battery
I have never had a bad battery
My old sony Vaio original battery is still working for an hour since 2009
And recently i started no to do so with my iphone xs max since it came out and still i didnt notice any issues either
Only my airpods not getting a full charge at 98%

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I think the real evidence comes from people like Steve Gibson who has kept his iPhone battery in good condition for many years, but not running it dry and not charging it all the way regularly.

Depending on the type of battery and how well made it is you should charge it accordingly.
My old Nokia dumb phone is still going but recently the battery is not holding as much charge.
That gets run down to empty each time, then fully charged whaile switched off.

For smart phones I charge to 90% and my laptops have BIOS settings to cap charging at 80%.
If I plan on taking a laptop out with me to use on battery I disable the charge limit and let it fill right up.
Most of it’s life it lives plugged in so does not need more than 80%

Batteries are chemical and suffer degradation depending on charge state.
At maximum capacity the chemicals may struggle to hold the charge where it is supposed to be which can lead to breakdown of the chemicals and a higher rate of quantum tunnelling.
When depleted of charge the chemicals usually degrade rapidly.

For Android there is a way to cap the charging as battery charge calibration and levels are just text files in the system


It’s fast charging that wears down batteries as the dendrites accumulate. Changes in battery chemistry has reduced this problem, but my iPhone still only fast charges to 85% and then trickles the rest in, ready for when I get up - this is usually pretty accurate.

As much as I value Steve Gibson’s opinions, there is still a lot of conflicting information from various battery experts and even some manufacturers; I just don’t worry about it - battery management is so much better than it used to be and can be changed by phone manufacturers through software updates.


I saw this post when it first came up (the original post). I almost jumped in, but figured I’d wait.

My answer would have been - who knows. Everyone has their own opinion on the matter - and you can find all sorts of research on all sides…

There is really no way to know what is the best method.

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Exactly, so I just don’t worry about it :slight_smile:


I agree and fo the same
The only thing that prevents me ftom using the phone ( mentally)
Is weekly usage report LOL

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I agree.

I recharge in the morning, whilst drinking my coffee. The Galaxy S20+, and before it the Mate 10 Pro, are usually down to around the 50%-60% mark and 30 - 40 minutes charging will bring them back up to 98% - 100%.

Theoretically, you shouldn’t leave them on charge all day, but at work, my company phone sits in a dock all day long trickle-charging (USB power from a monitor). After nearly 2 years, the battery still lasts for up to 5 days between charges (Huawei P20).

@Kasra, my 2010 Vaio battery still lasts for 1 - 1.5 hours (Core i7, 8GB RAM, SSD). It held for around 2 hours when new.

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I charge my iPhones overnight and use them all day until bedtime - I have no issues. If the battery starts to degrade over time then I’ll get them replaced for a few bucks.

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