Go Back   MacRumors Forums > iPhone, iPod, iPad, Apple Watch > iPhone

Thread Tools Search this Thread Display Modes
Old Oct 17, 2011, 05:54 AM   #1
Join Date: Jan 2011
Question How low should I let the battery get % wise before charging back up to calibrate???

We all know iPhone 4s battery sucks right now but quick question:

I've done it 3-4 times already letting the battery get completely drained before charging back up to 100%

Should I keep letting it drop to 0%?

Or does it even matter what % I let it drop to? Like would 35% and charging back up to 100% not calibrate it as well?

Thanks for your help
ap3604 is offline   0 Reply With Quote
Old Oct 17, 2011, 05:59 AM   #2
macrumors 6502
Join Date: Nov 2008
Location: Sacramento CA
For calibration, it's all the way to 0% and back to 100%. Apple says you only need to do this once per month, not everyday.

The rest of the time, it doesn't matter what % the battery is at when you start charging.
Twitter: @Zincous
Zincous is offline   0 Reply With Quote
Old Oct 17, 2011, 06:10 AM   #3
Join Date: Jun 2010
There is more info on this topic on the apple website
NWI73 is offline   0 Reply With Quote
Old Oct 17, 2011, 06:30 AM   #4
Don Kosak
macrumors 6502a
Join Date: Mar 2010
Location: Hilo, Hawaii
For general information on care of Apple batteries check out:


There's a bit more info on iPhone batteries here:


If you're having battery life issues, you're much better off playing with your settings and doing things like turning off blue tooth if you're not using it, turning off notifications for apps you don't use often (or don't need notified about), checking how often you have e-mail and calendar accounts set to "fetch" updates.

If all else fails, you can try the "backup" / "restore" trick.

The recalibrating just makes the "% battery indicator" more accurate, it doesn't change how long the battery lasts or "condition" the battery or anything like that.
iMac, MacBook, MacMini, iPhone, iPad, iPod Touch, AppleTV
Developer of Wiki Edit - the MediaWiki Editor for iPad
Don Kosak is offline   1 Reply With Quote
Old Oct 20, 2011, 05:24 PM   #5
macrumors newbie
Join Date: Oct 2011
Lithium-ion is a very clean system and does not need formatting when new, nor does it require the level of maintenance that nickel-based batteries do. The first charge is no different than the fifth or the 50th. Formatting makes little difference because the maximum capacity is available right from the beginning. Nor does a full discharge improve the capacity once faded. In most cases, a low capacity signals the end of life. A discharge/charge may be beneficial for calibrating a “smart” battery, but this service only addresses the digital part of the pack and does nothing to improve the electrochemical battery. Instructions to charge a new battery for eight hours are seen as “old school” from the nickel battery days.
socorosis is offline   0 Reply With Quote
Old Oct 20, 2011, 05:43 PM   #6
macrumors newbie
Join Date: Jun 2010
Let it go completely down to 0, then charge it back up to 100%. The problem is with how much charge it "thinks" it has. On Monday night I watched the entire first quarter of the dolphins - jets game on the Justintv app using AirPlay mirroring, all while it showing 1%! Since then I've had battery life that is very consistent with what my old iPhone 4 had. For instance, I unplugged at 4:30 this morning and with moderate use and not playing with any settings I'm at 52% right now at 6:42 pm. Just my experience.
bigtrip is offline   0 Reply With Quote

MacRumors Forums > iPhone, iPod, iPad, Apple Watch > iPhone

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Similar Threads
thread Thread Starter Forum Replies Last Post
Back from Android to new 5S, have some charging questions? Retroglide08 iPhone 15 Nov 17, 2013 12:39 PM
iBook G4 battery charging, from green to orange, back and forth Zotaccian PowerPC Macs 9 Feb 21, 2013 09:09 PM
Volume gets low when battery is low? michael31986 iPhone 6 Sep 28, 2012 10:36 PM
Battery seems to be accurate out of the box, do I still need to calibrate? shenfrey MacBook Pro 2 Sep 18, 2012 10:22 AM
Fasst battery charging but very poor battery life Thetonyk123 iPod touch 1 Jun 13, 2012 12:51 PM

Forum Jump

All times are GMT -5. The time now is 09:04 PM.

Mac Rumors | Mac | iPhone | iPhone Game Reviews | iPhone Apps

Mobile Version | Fixed | Fluid | Fluid HD
Copyright 2002-2015, MacRumors.com, LLC