Fast charging

Discussion in 'iPhone' started by kat.hayes, Sep 12, 2017.

  1. Techman82 macrumors member

    Joined:
    Apr 4, 2016
    #176
    Has anyone tested the 29w apple charger on the 8 plus to see if it's able to charge at 14.5 v, and use the full 29w power?
     
  2. ACST macrumors regular

    Joined:
    Sep 5, 2016
    #177
  3. masotime macrumors 68000

    masotime

    Joined:
    Jun 24, 2012
    Location:
    San Jose, CA
    #178
    Definitely not much better than 12W charging. It’s a very meh situation.
     
  4. alexstjo, Oct 3, 2017
    Last edited: Oct 3, 2017

    alexstjo macrumors member

    Joined:
    Sep 11, 2009
    #179

    Here is the best i could do with the 10W charger on Iphone 8+, ios 11.01, wifi, bluetooth on
    YES this is the old 10W unit, NOT the 12W

    % time (M:sec)
    5 0:00
    9 5:00
    14 10:00
    22 20:00
    28 30:00
    33 36:31

    it took so long i quit. I will be only using my 29w charger!
     
  5. deleder2k macrumors member

    deleder2k

    Joined:
    Apr 14, 2016
    #180
    When will they start advertising that the 7 can be charged almost just as fast?
     
  6. BeatCrazy macrumors 65816

    Joined:
    Jul 20, 2011
    #181
    Whenever they retrofit the 7/7 Plus with a USB-C Power Delivery chip found in the 8/8 Plus.
     
  7. deleder2k macrumors member

    deleder2k

    Joined:
    Apr 14, 2016
    #182
    My 7 charges 47% in 30 minutes with the 29W charger. I think that is rather decent.
     
  8. BeatCrazy macrumors 65816

    Joined:
    Jul 20, 2011
    #183
    No doubt. But you'd get that same speed/charging time with the (iPad) 10/12w chargers.
     
  9. The Game 161 macrumors G5

    The Game 161

    Joined:
    Dec 15, 2010
    Location:
    UK
  10. michael31986 macrumors 68040

    Joined:
    Jul 11, 2008
    #185
    How does iPhone 7 fare with the fast chargers. Does it ruin ohone.
     
  11. masotime macrumors 68000

    masotime

    Joined:
    Jun 24, 2012
    Location:
    San Jose, CA
    #186
    Hmmmm.... it only confirms the observations so far though. It seems like the last charger was probably charging at 12W.... ie the 12W charger charges almost as fast as 29W. Again, not particularly impressive. :confused: It makes more economical sense to stick with 12W charging unless you happen to have a 29W or more powerful charger handy if you also own an iPad Pro or USB-C MacBook.
     
  12. The Game 161 macrumors G5

    The Game 161

    Joined:
    Dec 15, 2010
    Location:
    UK
    #187
    you mean where it was at 46% in 30 mins? the brick there was a 21w charging brick
     
  13. deleder2k macrumors member

    deleder2k

    Joined:
    Apr 14, 2016
    #188
    Yes, I know. I just doesn’t accept the fuzz about fast charging iPhone 8. I’ve seen several reports about ppl getting 46-50% in 30 mins. If getting a 29 W saves you 2 minutes compared to the 12 W charger I think people are entitled to know it before blasting 60-70 or upwards of $100 in some countries on it.

    That is why I think a few guys would learn something new if some of the ones that did reviews of the fast charging option compared it to an iPhone 6s/7.
     
  14. masotime macrumors 68000

    masotime

    Joined:
    Jun 24, 2012
    Location:
    San Jose, CA
    #189
    Unfortunately that means very little. It was most likely negotiating 5V/2.4A. 21W does not match any known V/A charging speed I’ve known, possibly some fancy Qualcomm Quickcharge tech? Regardless, that isn’t a protocol recognized by iOS devices. Only USB-C Power Delivery has been known to work so far.
     
  15. BeatCrazy macrumors 65816

    Joined:
    Jul 20, 2011
    #190

    Good vid, but still missing some info.

    OK, so I think (?) I'm the first person to confirm/test this, but it actually aligns with the video above.

    First, some of my assumptions about the iPhone 8 Fast charge capability were wrong, because the 8 doesn't behave the same as the iPad Pro 10.5 and both 12.9 models. We know the iPads (using USB-C) can charge at either 29W (2A @ 14.5V with the Apple 29W charger) or 18W (2A @ 9V with the Apple 61W or 81W chargers).

    ^^^This is not what happens with the iPhone 8!

    Based on my testing with a P3 Kill-A-Watt meter, along with an Apple 1m USB-C to Lightning cable, and both the Apple 29W and 61W bricks, my conclusion is that the iPhone 8 can only maximum charge at 2.4A @ 5V! This is equivalent to about 12 watts, only slightly more amperage than you'd get/expect form a 10W/12W "iPad" charger, which outputs 2.0A @ 5V (i.e. 10W) to any recent iPhone.

    In summary, don't go and buy the 29/61/87W Apple chargers, expecting more/faster charger, vs. what you'd get with Apple's 10/12W iPad chargers.
     
  16. masotime macrumors 68000

    masotime

    Joined:
    Jun 24, 2012
    Location:
    San Jose, CA
    #191
    Thanks for the info! It provides a good data point. I assume you don't have / didn't test against the iPhone 8+ then - I am now wondering if the 15V charging is only enabled on the 8+.
     
  17. BeatCrazy macrumors 65816

    Joined:
    Jul 20, 2011
    #192
    Actually, I do have an 8 Plus (my wife’s), but it is currently at 100%. I will see if we can get that battery drained a bit in the next few days, then give it the same test as above.
     
  18. deleder2k macrumors member

    deleder2k

    Joined:
    Apr 14, 2016
    #193
    This is wrong. Theres a video on Youtube which shows a 29 W charger peak at 23 W.
     
  19. BeatCrazy macrumors 65816

    Joined:
    Jul 20, 2011
    #194
    Into an iPhone 8? Please share.
     
  20. michael31986 macrumors 68040

    Joined:
    Jul 11, 2008
    #195
    So fast charge isn’t really faster. Just use iPad charger. Fail.
     
  21. BeatCrazy macrumors 65816

    Joined:
    Jul 20, 2011
    #196
    OK, good news. I was able to test our iPhone 8 Plus tonight, which reported 32% battery when I began.

    Using both the Apple 29W and 61W charger, the 8 Plus was successfully able to negotiate 1.2A @ 15V for an ~18W power delivery. This is in contrast to my standard iPhone 8, which can do 2.4A @ 5V for 12W power delivery.

    TL;DR - iPhone 8 Plus can charge incredibly fast using the Apple USB-C to Lightning cable and Apple 29W/61W/87W chargers. Using the same cord/brick(s), the regular 8 can only charge at 12W, just marginally faster than an iPad charger + standard Lightning cable.

    NOTE: these “Fast charge” rates are only obtainable when the battery is <50%. Above that rate, the draw will slow down significantly, reduced to 5-6W when passing 80%.
     
  22. BigMcGuire Contributor

    BigMcGuire

    Joined:
    Jan 10, 2012
    Location:
    California
    #197
    Yeah just wow. Most of my Anker chargers are comparable to the green 12W charging bar... No way in heck I'm going to pay $70 for a 10% charging difference. that and the fact that my phone spends MOST of its life 80-100%.... lol.

    @ above post - how interesting 8+ charging differently than the 8.
     
  23. The Game 161 macrumors G5

    The Game 161

    Joined:
    Dec 15, 2010
    Location:
    UK
  24. The Game 161 macrumors G5

    The Game 161

    Joined:
    Dec 15, 2010
    Location:
    UK
    #199
    My testing in half an hour with the 29w charger

    It charged 34% in 30 mins on my 7 plus

    [​IMG][​IMG]

    Going to test the same on my iPad Pro 12.9
     
  25. daffie, Oct 5, 2017
    Last edited: Oct 6, 2017

    daffie macrumors regular

    daffie

    Joined:
    Dec 31, 2010
    Location:
    Holland
    #200
    Well...so far as fast charging is concerned using the 29W charger. No real discernable difference compared to the 12W ipad charger.

    Tested on my iPhone 8 Plus with wifi on and screen off. Starting point : 5%

    [​IMG]
     

Share This Page