Battery Health Capacity Dropped

Very true. I am just going to use my iPhone as per normal as I have done so far plus I know for sure when the new iPhone is launched I will end up trading this one for new launched device. But it is baffling that all three sets of measurements are different. Apple Max Cap at 98%. iMazing and Coconut on totally different level.

I noticed that in the above pic my iPhone 11 Pro Max says it has 98% life. My iPhone XS Max after a year was still at 100%.

decided to check with coconutbattery and it states I have 100% life and actually more charge capacity than the design capacity.

Something is not right with iOS 13 in my opinion.

I just don't trust the battery health value and use my phone normally.

Battery Health showing 97% and yet iMazing and Coconut telling a different story. My full charge capacity on 21 Jan was 2997 and now it has increased to 3032 (all at 70-80% charge). Only thing I have changed is stopped using is fast charge. Only use 5W at home and 10W at work. I only plugged in to capture those values. The device was not charging or left on charge.

Same here, I just used the phone for 4 months. Now the battery health is already dropped to 93%. Last month it was 95%. Dropped by 2% in a month!

I don't know what's really going on, but this has been the worst iphone I've ever had -_-

i had bought my iphone 11 not pro series, three months ago, battery health still 100 percent until now and i always use my 5watt charger, almost charge until 100percent every charged with 5 watt charger. In every day, i charge more often, from 60-75 percent to 100 percent always, never level battery below 50 percent. I very often charge my iphone 11. No issue problem about battery health droop about my habbit but always use 5watt charger original from new.

I hope it can help you...

I reported the same issue on here in February. Battery health suddenly started to drop. After some wise words from fellow members i simply ignored it. Used my device as per usual and the only change i made was use 5w charger only. Since February battery health stayed stable at 97% even though coconut and imazing were showing higher values. In between ive been running 13.4 and 13.5 betas. Today i decided to dfu restore my device as system storage under others was showing very high value and also i wanted to save blobs before i jailbroke my device. So i erased my phone and dfu restore my device to 13.5 and then restored from iCloud back up. Checked my battery health and it up back to 100% and is in line with coconut readings. Only explanation i can give is it could be an iOS glitch. Im sure members on here are more knowledgeable than me regarding batteries.

After 10 months it has dropped down to 92 percent Im not sure why since my iPhone 8 I had for over 2 years is at 86 I’m concerned but I think it has started to drop after I started using a 60 watt fast charger I should probably go back to the old one since it might be heating up my battery to much but I’m not sure if that’s the problem

I purchased my iPhone 11 pron on 23rd January 2020. Qnd my battery percentage is 84% as at today (5/11/2020). I never used my phone while charging. I always recharge my phone after 20% and unplugged when fully charged. Tbh I don’t play games also. Idk why my battery health draining so fast ☹️. Any solution for this or can anyone understand me wtf happened?

This is my iPhone 11 Pro Max battery at 15 months at 13 months it hit 69% and ballooned. Took it to Apple after 141/2 months to replace battery at half cost $40 then turned into $600 cause somehow the water damage sticker was red. Never been in water, never been dropped, never out of Best case on the market and only liquid it was near was when they saturated it with alcohol to Covid clean it before looking at it. Battery had issues from first week dropping health at a fast rate. $1500 brick that they won’t even touch especially after they lied about why I was there that day to get it fixed!

High temperature and highly charged state are what primarily accelerates battery aging. Charge your phone only to what you really need when away from home/office and your battery will last much longer. It's only been 1.5 months for me - but so far I observe no aging at all.

This is what my charging routine looks like:

This is the swollen failed battery from my iPhone 11 Pro Max after 15 months. It failed totally at 14 months. Battery capacity dropped from 86% to 66% and battery swelled to 2 times normal size in one day. The battery lost 7% capacity in the first 4 months. Took it to Apple store in February about that. Cleaned my contacts and said ok now, it’s normal to be at 93% capacity in 4 months. When I went to get my battery replaced at 141/4 months at a discount I was told couldn’t do it cause the battery separated my screen. I needed to pay $600 for a refurbished unit on top of the $1500 I paid for it. No way I was paying for defective battery that their own warranty states they fix when it’s due to defects in workmanship. I replaced the battery myself and I’m keeping it for lawsuit because I know I’m not the only one. And FYI the battery was deformed as is in the phone. It was so bad it separated from the adhesive holding it in place.

Yeah I wonder why some batteries degrade so exceptionally quickly. The two factors accelerating aging for any battery are high temps and high state of charge. Say you leave your phone connected to a charger exposed to full sunlight in summer - then you could definitely see the battery go in a couple of months. So to me the question is whether there are just some unfortunate customers who got bad batteries or if this is due to the environmental and state of charge related history.

I'm continuing with my optimized charging schedule. Now close to 2 months after purchase I'm still getting readings above 105% (105.2% just now). With an average of maybe a tad below 105%. But it's winter here.

IdrisSeabright wrote:

Yes, your phone is perfectly okay. Batteries are consumables. As long as it's over 80%, it is fit for use.

That's like saying "oh you got clogged arteries and a couple of cancers at 30 - that's totally normal, as long as you don't die before 70 there's nothing to worry about". Just as human health is very much influenced by the choices we make so lithium ion battery health reflects how we use and charge our phones.

This is what my iPhone 12 pro max battery health looks like after 2 months of use and 52 charge cycles:

The most important thing: keep the time spent at high state of charge as short as possible, especially when operating at high temperatures.

Charge it like this and the battery will last (almost) forever:

Many people think between 20 and 80% is best and its most important to avoid low state of charge - but that is just not true. For longest life go as low as possible while avoiding staying below 20% for too long. See these results with LiCoO2 batteries for example (https://www.sciencedirect.com/science/article/abs/pii/S0378775316309247):

Capacity is actually maintained better all the way to zero SOC. But below 20% internal resistance starts to grow a bit faster - at least when measured at SOCs between 0% and 20%. So I think 20% is a good target to shoot for (e.g. for long term storage if SOC is continuously monitored). I top up to 30% often during the day (my charger automates this) - and if I'll be away from a charger for some time I might charge a bit more. At night 20% is maintained and I charge up to 30% at 6am. I think this is close to optimal.

Health has improved a bit since the 8 Plus was put on the ~20% charge storage plan:

Note that the battery is >2 years old and was always charged to full overnight (until put into storage) yet it has held up very well. My wife has a 11 pro max which is already at 88% after a year. The 8 Plus charges to 4.35V and iPhone 11 and 12 to 4.45V. I think it's this high full charge voltage which has made the latest iPhones so susceptible to early degradation.