iPhone 6S slow and low benchmark scores.

That's correct. Like I have detailed earlier, I started running benchmarks when my phone felt unusually sluggish. After I changed the battery following CodrutM's advice, the benchmarks run at normal full speed, but most importantly, it frankly feels like a new phone again (almost).

At the risk of getting censored/deleted again, I am disappointed in how Apple is handling this situation. I can understand there is a limit to how far back a manufacturer has to replace faulty hardware for free. I think the solution is (maybe) reasonable, as well, slowing down the affected phones to prevent unexpected shutdowns, but not informing owners - expecting them not to notice, is not the right choice, IMHO.

Anperis: you are probably not asking me, but after I changed the battery, my phone runs at full speed at all battery % levels. Before I changed the battery, it ran at a little over half the expected speed while at 100% battery, and almost exactly half speed, when the battery dropped to 60-70% or below.

Hi n808n808,

I experience the same problems as you, with my benchmark being half of what it once was. Even replacing the battery did not do the trick for me, I've tried cool resets and reboots.

Did you have to do any trick for your phone to recognize that the battery had been replaced and it had to re-run the slowdown logic?

Hi fff123,

I had similar problem with my iPhone6 - low benchmark scores, quickly dying battery and sluggish performance. Changing the battery in a non-official service center didn't resolve the issue, despite I payed for a "very good quality" battery. Situation went even worse - my phone did restart a couple of times during the morning alarm being connected to the charger and once it just stuck at 50% of charge after being charged during the whole night! So I went to them again and believe it or not - they said to have cleaned up some physical contacts inside the phone which were responsible for power delivery - and all problems gone! I now have full benchmark scores even at 15% of charge, phone works fast like new and battery holds very well.

Service man said it is quite a common issue when contacts inside the phone are oxidized and can't handle the power delivery well due to the additional resistance. He also said the battery controller inside the phone might also break thus leading to a non-sufficient voltage for the electronics (which wasn't my case). iOS is so smart that it senses the lack of power and throttles the CPU speed down to keep it working and not restarting (however it still may restart on extreme drops of power delivery), which is quite a smart thing if you ask me in the end of the day.

I should also add that my iPhone 6 is 2.5 years old and used very very heavily even in high humidity conditions, so oxidization of contacts wasn't a surprise after all.

So even if battery change doesn't solve the problem my advice would be to ask some competent serviceman to clean all internal phone contacts (there are multiple pin connectors there) from possible oxidization and to check the battery controller.

I hope it will help someone not to ditch his old phone in despair.

Ouch your problem might be a

Battery drain issue.(Usually caused by hitting something on the board right where the connection for the battery is located).

Or Water damage.

If your positive that your battery health is above 80% capacity and your battery was fully charged at the time of the test,and sure that it doesn't drain even while on standby and lowpower mode was turned off then you quite possibly might wanna try a (D)evice (F)irmware (U)pdate restore.

If you recently replaced the battery like you said than a dfu restore should do the trick.

I replaced my iPhone 6s battery and yes it fixed it. If you can , test through the batteries there before finally settling for the best. I tested about 4 batteries and all were too bad , I almost gave up then tried the last battery and it worked . My phone feels very very faster now

Hi,

About 1 week ago I got message from warranty center that mine 6s is bad battery and the main mothear board of my iphone 6s. So now is ordered new iphone for replacement and it takes anout 2-3 weeks. This week I have got new message that it can take 2-3 weeks extra or I can take it back in same condition! :) Today I will be calling to warranty center.

Did Apple send you a message out of the blue for like a recall?? or

were you able to send your device to Apple outside of your warranty perhaps? I've got the same issues, plus I have separate cases and issues, not necessarily batt specific in relation to, filed w/ AppleSupport. I am not overly impressed with the 7 so I'd like to stretch out the life of both devices.

Perhaps some apps or links for diagnostics/common issues that any one could reply to me with? I have, only recently, made diligent efforts to search for problems/solutions and have only made small forward movement with AppleCare. Sooooooo... any suggestions community? Also any thoughts

on increasing the likelihood that AppleCare will fix somethings with my out-of-warranty 6s?? I ask because I feel like if I'm tied down to iOS firmware for life and someone can use whatever standard for service and join iCloud. Perhaps, I can get new battery if it's basically a recall or what not

My 6s had the battery at 81% of its original capacity and had very low geekbench 3 scores (I use geekbench 3 cause it s faster). Below 30%, the clock speed would go to even 900 mhz. I changed the battery and now my 6s scores 4500 in multiscore with 5%.

I 've said exactly the same thing and they deleted my post because they say it was speculative. Since when if you say the truth its speculation. All users and geekbench with used battery confirm it.Why yet Apple haven't say a word? My phone works on 600mhz cpu and when its on charge 837-1227. After the update 10.2.1 our phones are useless. I m just discussing my experience. I hope you won't delete it again.

Apple now also admits to this questionable practice:

https://www.cnet.com/news/apple-slows-down-older-iphone-battery-issues/

I claim the practice is questionable, because Apple has kept it hidden until now. In my humble opinion, it should have been a visible user settable option, similar to the Low Power option. It's fine that Apple would then default to try to prevent shutdowns by slowing down older phones, but users should be able to set it back to the speed they paid for, when the device was purchased.

I’ve had the battery replaced in my iPhone 6 by a reputable local company (Gamer Tech Of York, UK), but I’m afraid my Geekbench 4 speed scores haven’t improved. Typically the reults are 992 (single core) and 1803 (multicore), which is way down from the averages of 1463 and 2459.

Does the battery have to be replaced by Apple to get the high numbers back? Or is there some other fiddle I have to do?

Anyone’s help would be greatly appreciated.

Cheers!

At the risk of being censored (again) -- I replaced the battery myself in three difference iPhones, all came back to full Geekbench speed. That was back in April, after I first posted the explanation for this whole mess, and they have been running fine since.

Sorry to hear about your example, the only explanation I can offer is that perhaps the new battery already has such poor capacity that iOS figures it best slow it down. A new battery can end up with a poor capacity ("wear level") just from being stored a long time with a very low voltage.

I replaced the battery on my iPhone 6 myself around Dec 2017, after reading about the news about CPU throttling by Apple on latest iOS versions, but my Geekbench scores haven't improved. Single/Multi core scores are 1070/1796 respectively, compared to expected 1463/2459.

As an example, when I open the camera app, the screen would go blank for about 5-6 sec before being shown with what the camera lens is seeing. So, I've missed countless moments that I couldn't take a picture while waiting for the camera to get ready.

OK, I bought the battery from Amazon (where else would you get it from? :-) ) so does it mean that I got a poor quality battery? Since you managed to get the iPhones back to full speed, can you tell me which make/brand of battery did you buy? I'd like to try replacing the battery again.

Thanks