Other Is it true charging 0-80% stresses the battery the same as 80-100%?

[QCassidy352]

To me it is simply not worth all the effort to possibly extend the battery life of my phone maybe 6 months to a year? And at what cost? If I have to be careful not to overcharge it, I have to worry about if I have enough battery since I didn't fully charge it, etc. Is is really worth all that? Battery replacement is very cheap and will make your phone run like brand new for $89. Why not just use it hard, use the software designed to help you prolong it without any additional effort on your part, and replace it when you need to.

Apple builds "charge to 80%" into the software, and it's a simple toggle to turn it on. Since the battery on my 16 Pro easily lasts more than a day even starting from 80%, why not use the setting and maybe extend battery life a little? If I needed to charge to 100% to get through the day I'd do it, but I don't.

 

[2761216]

Battery "stress" and shortening of lifespan occurs when you charge a battery too frequently. Ideally, you should let your phone's battery drain to about 10-20% before putting it on the charger for any amount of time to any percentage.

I don’t know where you’re getting that info from but it’s not true in case of Li ion batteries in your phone.
The recommended battery range to absolutely maximize the battery life is 20-70% but you can charge it as often as you like to whatever percentage you choose. It is indeed recommended to partially charge multiple times than a full charge.

 

[Adora]

Doesn't make much sense because if it was battery internal self discharge it would do it in airplane mode too.
Try this, iPhone, Settings, [tap your name], Find My, Tap on Find My iPhone and turn OFF Find my network and Send my Location, then repeat your 2 day powered off test.
Find my network is tyenonly process to run after powering off.

That is already turned off everywhere since I know it's not completely off with that function.

 

[now i see it]

The reason the world is juggling with how to take care of lithium batteries is because ALL the lithium battery producers spec them and the chargers to OVER CHARGE the battery. If they'd spec them to a non stress voltage and charge them to that, the battery would last 3000 times longer but only provide 75 to 80% of the capacity.
Since battery manufacturers need to sell batteries and can't stay in business if a battery lasts 15 to 20 years, they -over charge- them in their specs recommendations so it'll only go 500 cycles.
Its the dark & dirty side of the battery business

 

[v0lume4]

The system is designed to rapid charge to 80% or so and then trickle charge it the rest of the way to 100%. The reason is that Lithium Ion batteries are volatile and nobody wants "My device exploded"/"My device burst into flames" stories.

If you could remove the "trickle" (filter), it would likely charge right to 100% just as fast as it did to 80%... but then you'd probably be one of the ones with a story about a spontaneous fire/burst.

Does it take the same amount of energy for the last 20%? I don't know. Logically, I would say it doesn't but there's room for anything when wild guessing.

Do you get more for your money charging to 80%? That's "eye of the beholder." There is some kind of use life logic in play that says not "topping off" will extend useful battery life. On the other hand, you may find yourself in situation where the other 20% would have made a meaningful difference and no way to recharge at such times.

My own approach is to buy the 80% idea most of the time. However, if I know I'm about the use the laptop for an extended period of time but do not know if I'll have access or opportunity to electricity, I'll go ahead and charge it the other 20%. By the end of such days, I'm down towards 0%-20% but also getting to wherever I'm traveling... and thus regaining easy access to a recharge. There, I'm back on the 80% train... until perhaps the return trip where I may go on up to 100% again for the travel day.

In short: selective "full" to fit situations where I don't know if I'll have access to a recharge but anticipate heavy use... otherwise playing along with the idea of 80% perhaps being better for general purpose use.

Is this the best possible way? Who knows? It's just the way I choose to go. If the battery wears out too much over time before it's time to replace the device, I'll pay the price to put in a new battery and restart the process.

This is my approach as well.

 

[Big_D]

The bad part, for the battery, is letting it go flat. That causes more damage than constantly charging it. Optimum is supposed to be 30%-70%, although most manufacturers say 80% is also still ok. If it gets down towards 20% start charging as soon as feasible. If you constantly let it go down to 0% - 5% you will probably shorten the life of the battery more than charging it always to 100%.

 

[The Cockney Rebel]

Just charge your battery, and don’t worry about all these “professionals.”

I charge mine every morning (with my watch) to 100% and no problems.

If your battery degrades, it’s less than a hundred quid to get a new one.

Is you stressing worth £100?

Look at it that way.

 

[Parowdy]

Apple builds "charge to 80%" into the software, and it's a simple toggle to turn it on. Since the battery on my 16 Pro easily lasts more than a day even starting from 80%, why not use the setting and maybe extend battery life a little? If I needed to charge to 100% to get through the day I'd do it, but I don't.

You’re forgetting that this is a relatively new feature introduced alongside the iPhone 15/Pro. Any 14, 13, 12 and prior don’t have that toggle.