Charging iPhone Concern

Discussion in 'iPhone' started by PatrickW98, Mar 29, 2013.

  1. macrumors 6502


    Apr 26, 2012
    Subrubs of Chicago, IL
    I charge my iPhone every other day. On a new charge in one day I go from 100% to about 55% at the end of the day. The next day I go from 55% to about 5% by the end of the day. Is it better to charge it daily at 55% or every other day at 5%?
  2. macrumors 603


    Dec 2, 2010
    Atlanta, GA
    Doesn't matter, either way.
  3. macrumors member

    Mar 21, 2011
    It doesn't really matter, at least run the battery completely out (the phone dies) and do a complete charge every month.
  4. macrumors 68000


    Nov 2, 2006
    And Yourself?
    I agree. Just make sure to drain your battery every now an then!
  5. macrumors member

    Feb 16, 2011
    It does matter. Deep discharges dramatically reduce the life of the battery. You should recharge it as often as possible. Don't ever run the battery completely out unless you want to calibrate the % battery meter, which is kind of useless anyway.
  6. macrumors 68020

    Dec 13, 2012
    Southern California
    Go to

    There you will find all you need to know about battery care. It's a great site designed to keep the customers informed. All you have to do is read.
  7. macrumors member

    Mar 21, 2011

    "Use iPhone Regularly
    For proper maintenance of a lithium-based battery, it’s important to keep the electrons in it moving occasionally. Be sure to go through at least one charge cycle per month (charging the battery to 100% and then completely running it down)."

    Even Apple says so.
  8. macrumors 604


    Jul 4, 2008
    Silicon Valley
    Apple is all about being minimal and simple right? Just use it. It just works.
  9. macrumors member

    Feb 16, 2011
    "it’s important to keep the electrons in it moving occasionally"??? That sounds written more by a coach than an engineer. Anyway, a 100% discharge cycle every month does nothing to preserve or improve battery life per se, it just recalibrates the meter, which can prevent a premature shutdown when there's still charge in the battery but the meter thinks it's almost empty because is not correctly calibrated. So you could say that there is an apparent increase in capacity because the meter now lets you go deeper in the discharge cycle. On the other hand it's well known that deep discharge cycles reduce the battery capacity faster than shallower cycles, so you might not want to go deeper anyway. So, deep discharge cycles once a month are not going to really damage the battery, but the OP was asking about doing deep discharge cycles every other day, not once a month. And that does matter.
  10. macrumors member

    Mar 21, 2011
    Yes, electrons do move?... Ok, dont listen to Apple, the creators of the phone and listen to this guy.
  11. macrumors demi-god

    Apr 20, 2009
    I would never let my battery go that low on a regular basis. What if you have an emergency when the battery is almost dead? Power failure, accident, etc.....

    Paranoid maybe but letting it go that low every day or every other day is too risky.

    I don't care if my battery doesn't last a year or whatever. That's what warranties and AppleCare+ is for. :cool:
  12. macrumors 68020

    Apr 12, 2011
    I have never let my battery drop to zero and then recharge. Waste of time and does nothing for the battery. I just recharge every night. My battery last just as long and have never had any problems with batteries in my ios devices over the years. Want to recalibrate your battery, wait until battery is at 100% and with charger still connected to phone, reboot phone.
  13. macrumors 68030


    Aug 16, 2011
    Philadelphia Area
    Just plug ur phone every night when u go to bed. Why the heck would u want to start the day at 50%? It makes no sense. I have never had to worry about my battery because I charge it every night while I sleep. Simple.
  14. macrumors member

    Dec 2, 2006
    I'll admit to being a bit anal about Li-ion battery care, especially with non removable batts. Here's a few things I do - I also use it ~ 40% per day.

    - charge daily, as mentioned shallower charges are better
    - avoid charging to 100%
    - minimize average voltage, but also leave yourself enough emergency capacity. So I charge ~ 80-40-80 or 70-30-70
    - to satisfy the last two points, I charge in the morning so the batt sits at a low voltage while idle overnight, and for convenience use a light timer to charge say 6 to 7 am, just before I wake up.
    - I also charge bareback on marble to minimize temps, just out of habit, but probably unnecessary - these devices stay pretty cool while charging.

    Here's some data to back it up... The chart is a military study on capacity loss from different Li-ion charging habits - it supports the Batt Univ points.


    I realize most people don't care and won't bother, but once your set up, there really is no extra work involved, except 5 secs to adjusting the light timer. It's worth it to me. YMMV
  15. macrumors 6502

    Jan 20, 2012
    LL22, UK
    i just charge mine at any level any time for any length of time, for the 2 years i'll have the phone it wont suffer
  16. Contributor


    Dec 8, 2009
    I think you are EXTREMELY anal about batteries :D

    Your link is very interesting but in my opinion an user could charge his iPhone to the 100% without any problem, if he's going to use it after that.
    It is important not to leave the phone at 100% without use it (switched off or in aero mode) for a long time, but if you're going to use it every day, I think is perfectly safe to charge it to full capacity.
  17. macrumors 6502a


    Dec 24, 2011
    daily at 55%
  18. macrumors member

    Aug 21, 2012
    San Francisco
  19. macrumors member

    Dec 2, 2006
    Guilty as charged... I'm a flashlight hobbyist and good ones use Li-ion batts. You really have to understand Li-ions for that since the batts can turn the airtight tubes into pipe bombs.

    Yeah, no problem topping up to 100%, it's what every manufacturer expects and plans for... the only question is whether you'd like your battery to last longer than average/expected. The military study chart shows a significant difference in capacity loss between 100-50-100 charging and 75-25-75 charging.... for me, that's worth 5 secs of setting a light timer at night.
  20. Contributor


    Dec 8, 2009
    Sure but my concerns aren't for the 5 secs needed to setup the timer. I can't afford to start a work day with only 75% of charge, because I'm not always within a power plug range so I need that 25% more.


    That article, without highlighting any technical study, basically says something totally different from what posted by reppans ...
  21. macrumors member

    Dec 2, 2006
    I agree, I probably wouldn't bother going doing an extra charge in the middle of the day just to be kind to the battery. I just suggest the timer routine and being kind to te batt. for people like the OP and I that use around 40-50% per day.

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