I replaced my iPhone 6 battery about a year ago, Lately it drained very fast, so I replaced it by a new iPhone SE. I used the old iPhone 6 as an iPod. I routinely downloaded Youtube videos and listened to them when I walked in park. After one hour walk, the battery had only 50% left. I powered it off and waited about 12 hours then powered it back on, the battery showed only 14% left.
What is going on??????
iPhone 6
Hey ching-sen,
We understand that you're concerned about the battery life of your iPhone while it is both on and off. This article has great tips on how to maximize battery life: Maximizing Battery Life and Lifespan
You can also see how to check the maximum capacity with the information below from this article: iPhone Battery and Performance
"Your battery's maximum capacity
The Battery Health screen includes information on maximum battery capacity and peak performance capability.
Maximum battery capacity measures the device battery capacity relative to when it was new. A battery will have lower capacity as the battery chemically ages which may result in fewer hours of usage between charges. Depending upon the length of time between when the iPhone was made and when it is activated, your battery capacity may show as slightly less than 100%.
A normal battery is designed to retain up to 80% of its original capacity at 500 complete charge cycles when operating under normal conditions. The one-year warranty includes service coverage for a defective battery. If it is out of warranty, Apple offers battery service for a charge. Learn more about charge cycles.
As your battery health degrades, so can its ability to deliver peak performance. The Battery Health screen includes a section for Peak Performance Capability where the following messages may appear."
You'll want to ensure the battery has a good maximum capacity, as that affects how a device performs and the battery life. You can read more about that in the linked articled above. Let us know if you have any questions about that.
Take care.
iPhone 6 battery drained fast even it was powered off.
