How is the battery percentage calculated?
The capacity of a battery relates to the time you can expect it to last and is measured in milliamp hours (mAh, i.e. electrical power the battery produces). The mAh you can expect to get from a fully charged battery is often marked on the battery label, but if it isn't on the label, then you can obtain it from the battery manufacturer's website. The mAh declines as the battery gets used, so by using a multimeter you can calculate your battery capacity.How to measure battery percentage (Basic using multimeter): Read the fully charged battery capacity on the battery label. For example, a lithium battery 2,400 mAh. Write down the battery's mAh.Turn on your multimeter and set it to measure mAh.Place the metal tab of the red wire from the meter to the positive terminal of your battery, i.e. "+". Place the sensor of the black wire to the negative terminal of your battery, i.e. "-".Read the meter display and write down the measurement. Use a calculator to divide the figure you wrote down from the meter by the figure from the battery label; then multiply the answer by 100 to get the percentage capacity in your battery. For example, if the meter reading is 600 mAh and the battery label is 2,400 mAh, 600 divided by 2,400, multiplied by 100, equals 25, so your battery capacity is 25 percent.If the battery is fully charged, it will be same as the figure you wrote down from the battery label (i.e. 100% ). If the battery is not fully charged, the measurement will be less than the battery label.More info: How to Calculate Battery Capacity | eHow
Why is my iPhone battery percentage incorrect?
Agree with all of your opinions. I’v recently got this kind of issue. My iPhone shuts off randomly with even 80 percents battery life.I’ve tried to restore my iPhone and calibrate iPhone Battery. But none of them works, so I downloaded some free apps to check the iPhone battery health, and found my battery wear level reached 72%, and the battery charge cycle counts reached about 800, which is crazy. See the below screenshots.Now everything is clear. It’s my battery problem, and I have to replace it with a new one.
IPhone 6 battery suddenly dying faster?
Quick background: I have the iPhone 6 (not plus), Sprint, 128GB, black front, iOS 8.3. I am very OCD about my battery percentage on my phone, I always have been. I'm in high school and my first hour is in a new building that had recently been built on campus and there's no signal ( I know bad signal kills battery). But, normally with my phone on airplane mode and grayscale, only listening to music for 40 min. and by the end of 1st period my phone would only be at 93% AT THE LOWEST. As of last weekend however, my phone in 1st period (airplane, gray, NO music) without doing a single thing, goes down to 85%. Dying quickly by the end of my 6hr school day. Last night I went to bed at about 11pm with a battery of 41%, and I woke up at about 1am (2 hours later) and it was only at 80%. So, not only is it dying faster for no reason now, it's also not charging as fast as it used to. As well as going down in battery while in use on the charger. Now, yes I have downloaded apps and whatnot, but I know it's not an app because it started over a weekend when I didn't do anything different. I have not changed my patterns of battery saving for 6 months in having this phone. Thank you for any help.
My iphone 6 battery is suddenly dropping from around 45% to 25%. Is it a software issue (ios 9.2.1) or is my battery dying?
You are not alone. I had the exact same problem with the iphone 6, starting about September 2017. Dramatic drops in power from 100% to 60% to 10% for no apparent reason. Went to the apple store and they now have a diagnostic they can run that confirms that the battery is officially "Consumed".Those are nice words that really mean: Apple Engineers specified a battery in the iPhone6 that doesn't last longer than 3 years and its up to the consumer who paid nearly $800 for the largest memory version of the phone to decide whether to pay $80 at the Apple store to have the battery replaced, take a risk with a 3rd party to replace the battery, or spend another $800-$1000 on a replacement phone. On top of that, they make you wait a couple hours at the store and don't even employ the technology to text you when its ready.The good news is that for the thousands of people having this problem -- its normal and expected and you don't have to waste time reinstalling the OS and all those time wasting activities. Its simply a fact that the Iphone 6 battery is not designed to last long and Apple fully knows this as their diagnostic tools now confirm it.
Why does my iPhone suddenly die when the displayed battery percentage shows 15-30%?
Thanks for the A2A.First, “quickly” is a subjective term. Maybe you could add some details about how long the battery typically lasts and what your typically use of the iPhone is during that time. That would be very helpful.In general, your battery’s life depends on how you use your phone. If you spend a lot of time talking to others, it is going to drain quickly. If you spend a lot of time playing games with a lot of action or augmented reality (especially Pokemon Go), it will drain really fast. If you use Facebook, it will drain really fast.One thing you can do is to tap on Settings, then scroll down and tap on Battery. Tap the tab that says “Last 7 Days.” This will show you a list of apps that used the most battery power over the last week. Try to reduce use of anything that is over 25% (if you can stop using things that list over 15%, even better). If you see anything over 50% my suggestion would be to not use that app at all unless absolutely necessary, and even then try to limit use to when you are plugged in.If you still feel the battery is draining too fast, take your iPhone to an Apple Store or Authorized Apple Service Center. They will run diagnostics on it and let you know if it needs to be replaced.
What's the difference between 3.1.3 firmware iphone update and 3.1.2 firmware?
Well the only difference basically is it fixes the battery percent misreadings. No changes in performance, battery life, nor memory or whatever. The iPhone version of the update also brings a baseband update which updates the baseband to an unlockable one (05.12.xx) OS 3.1.3 also patches a exploit that is used with jailbreaking (a bad thing since like 30% of people jailbreak their iPhones). Upgrading from OS 3.1.2 to OS 3.1.3 is not really worth it..... especially if you have T-Mobile and need the unlock. The blacksn0w unlock also does not work with OS 3.1.3 (even if you use PwnageTool to keep your 05.11.07 baseband). blacksn0w isn't updated for the new CommBase in OS 3.1.3. Need help? jreyes223@gmail.com
IOS 5 won't activate on my iPad 2!?
I had my UDID registered and I have iTunes 10.5 beta, but when I try to set up iOS 5 it will say that it is unable to activate because I am not an apple developer.