iPhone Battery — The 40-80% Lie

How should you really charge your iPhone?

Do you need to micro-manage your iPhone charging? Like never let it go below 40% or above 80%? And, spoiler alert, in a word, no. In two words, hell no. No, you don’t. Nobody does. Not on any modern iPhone. Not on the upcoming iPhone 13 or iPhone 12s. Not on any of them. Nobody has time for that!

And I’m going to explain to you why, and I mean exactly, precisely why. Because I got you.

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Thanks for watching, see you next video!

[ReneRitchie]

🤔 What other iPhone myths do you want to see videos on?

[zollotech]

Thank you for reiterating. Been trying to tell people this for years.

[zhangliubao]

2 years later, iOS added 80% limit to battery charging..

[El_Ouazzani]

Hi all, I'm doing the 30-80 charge, iPhone 12 Pro Max battery health 94 % after 30 month (bought it 1 May 2021)
Definitly working when I compare with my friends / family who does not do it....


"EDIT": If it's useless, why did Apple make the charging limit an option in the settings for iPhone 15 series ?

[Boblambda]

Before Tesla and the Battery University guys came up with their own testings, there were so many product engineers and marketing experts saying not to worry about batteries wearing out (so you can pay them for a new one when that happens)

[ConorORegan]

Whenever battery health gets brought up on Twitter it always ends up being toxic 😂

[reviewsyou]

You were so right Apple included the option to limit charging to 80% now and previously had an algorithm to not top off the battery until right before you need it. This didn't age well. You were wrong then, you are wrong now. Hopefully you now know and can make a follow up video on it?

[samjustice]

I'm an engineering student that works closely with professors that know battery chemistry. Keeping lithium ion batteries around 50% allows the cell to be in its most stable chemical state which minimizes chemical degradation. Only allowing your phone to charge between 40% - 80% will maximize the longevity of your battery by up to 4X. You've just got to decide if its worth it to you.

[nish]

Can you post the reference papers you used for this? Because the 40-80% was a general outline that was presented on a research paper.

[johnlabernik]

None of these are myths, they are just much less significant than heat issues. User adjustable charge alerts and limits would automate the micromanaging issues.

[vinizan]

I have two scientific articles saying that charge until 80% can double the lifespam of a battery. Asus, Xiaomi and Samsung have now the 80% limit charge in their phones, are their engineers wrong?

[sawwaa]

80% Limit is officially here lol You were wrong then, you are wrong now.

[old-wise-one]

Rene - The issue is HEAT! The deeper you discharge the hotter your battery gets (can swell up) for either charging or heavy usage. You also have the cycles the more you burn up the shorter your batteries life. This has nothing to do with 40~80 window. Then you have storing a phone for a year or so! You want is half charged to prevent it from breaking down.

[randaranatunga]

Honestly I would take a longer lasting battery health over faster charging/ wireless charging any day

[EvanNakagawa]

The only "micro-managing" I do is use a slow 5W charger to charge my phone overnight. I have a wireless charger at my desk for convenience, and a fast charger in my bag when I need a quick top-up, but otherwise I can usually last a full day.

[decoderkiller]

Thanks dude. I was about to believe what battery manufacturers, engineers, research papers and companies themselves recommend. Instead I’m going to believe you! You seem more knowledgeable than all of them

[nkordo]

The video is built on the same common ignorance as other similar ones. First, when the battery charges to 100%, the voltage is over the safe limits of Co based Li-ion batteries. Yes, they use chemicals to reduce the aging effect, but it still happens. Second, the phone battery percentage range is the range that is usable for the user as the phone shuts down before reaching the actual battery level of 15...20% to protect electronics. People who use automation to limit charging to 75...80% can keep their batteries alive for longer. But fanboys who have a brand new iphone every year obviously can't care about it as someone else will deal with the negative effects.

[thetechexplainr]

Everyone does this now. I do, but I use a device called Chargie to help me maintain charging up to 85%. It helps. I hope you make an updated video.

[hondaaccord]

I replaced my iPhone X battery in may 2022, and I replaced a iPhone XS battery that was at 81% capacity and my iPhone X was at 86% healthy. I’ve been doing the 40-80 rule with an automation to turn on low power mode at 40% so I know to plug it in and charge it until “battery sufficiently charged” at 80%.I gave the XS to my mom for Mother’s Day and told her to follow this regimen. She has not and her battery health is 95% and mine is still at 100% so when I’m able to on my days off I follow this regimen and it’s working for me. This way when I need to charge it to 100% if I’m gonna go somewhere I may not be able to get to a charger for a while, my battery health will still be at 100%, so this 40-80 rule isn’t entirely false. If I was just carefree with it and did whatever I want for as pricy as battery replacements are, I’d be not getting my moneys worth. The att insurance costs more in a year for the $29 copay for a battery replacement at their store of choice versus a 1 time replacement when you need it.

[stev]

There is so much conflicting information for battery health and honestly when I had my XS Max for 3 years I charged it all the time whenever it got below 50% because my job allows access to charging (so does my car) and my battery health was at 93%. So while you may not have to, I’m pretty sure it’s definitely not a bad thing to do. This is just annoying because so many verified sources are spouting information only for a year later to have something like this video say none of that is necessary so it’s like, who really knows anything then? Lol.