Chosen Solution

I just bought Iphone X 4 months ago but my battery health drop to 86%. It is normal or not?

That’s not normal. See if Apple will get you a replacement.

“Health” is a measure of discharge rate. The phone has logic that calculates the remaining capacity and compares it to the battery spec. There are apps, sometimes built-in, that will discharge a battery when nothing else is happening for a short time, calculate the discharge rate from the voltage drop, and interpret that as “health”. Every time you discharge a Li-Ion battery to below 10% of spec capacity or charge it to above 95% spec capacity it is damaged slightly, loses capacity slightly faster than normal. The charger furnished with a phone works with the phone to prevent over (+95%) charging, an aftermarket charger may not. Degradation may seem to be excessive during the early part of a battery’s life. Li-Ion batteries have a learning curve and increase capacity during the first series of charging cycles. That’s why EVERY device that uses them says to FULLY charge them BEFORE first use. Few users do this. (I tested a Li-Ion battery pack with a new drill after an initial timed, not indicated, full charge, and timed how long the drill would work, bu drilling holes in wood. I repeated this 5 times. Each time the run time increased. The “capacity” after 5 charges was 20% more than the first time. For you, more important than absolute “health” is whether its “health” continues to degrade faster than 0.75% per month. A typical Li-Ion phone battery will provide 70% capacity after 3 years of being in continuous service.

i bought a used iphone 7 and the batery health at first was 91%/after one week it dropet to 85% is this normal or should i worry?

I brought my iPhone se 2020 I got it when the battery health was 95% so I was using it for like a week ago but when I check it now i saw it drop down to 91% I think what kind of problem is this

I bought an iPhone 7 on a reseller and the model letter starts with “M” and the battery life indicates 91 % but after 3 months of usage it drops to 89 %. Does the rate of degradation is normal?

I used iphone x when I bought battery health is 95% in dec 2019 but today i check battery health 87%

I bought an iPhone XS about a month ago With 94% health, now it’s at 90% is it normal?

bought an iphone 6s plus with changed battery (99% health). now after one week its decreased to 92%…..

i buy new iphone 7 but after 17 days my battery dropped to 98 %. my screen on time is 3 hrs aproxx. please tell is it normal? and solution to solve

i brought iphone 7pluse 6 mounths ago but now the battery health came to 79% i literally don’t know what to do about it ,if you have any idea how can I increase my battery health or any other alternative thing that I can do? plz help me

Battery health depends on how much you consume battery charge. While the charger is connected disconnecting too many times also affect battery health. I suggest all the users never go below 20% and never charge up to 80%. The iPhone has a feature to optimize charging on. Never leave your iPhone on charging overnight.iPhone XR to up you can’t see battery health after replacing. The battery works but you may lose health indicators. My iPhone xs max battery health was 82%. How I made Battery health 100% and its work for one time.