Is it a psychological thing like how time seems to move faster when you’re late? Or is my phone lying to me?
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Your phone doesn’t really know how much charge your battery has. It knows what battery was put into it, it knows how much charge that battery can hold, and it call tell if it is at a full charge or not, and can tell when it’s below the halfway point. That’s about it. What your phone does after that is keep track of its own power usage, compares that information to how much charge the battery can hold, and give you an estimated percentage (which it often lies about, anyway).
The problem with all of that is batteries lose their capacity over time, so depending on the age and how much use the phone has the battery may drain a lot faster than the phone thought it would, and by the time the battery starts showing signs of being at less than half a charge your phone thinks it should still be in the 70s. Your phone won’t just go, “whoops, better fix that” and drop your percentage, but it *will* have that percentage tick down a lot fast than it did before until things meet in the middle. And if you keep using it past that point, depending on the manufacturer, it’ll drop the percentage below what your charge actually is because *completely* discharging a battery without properly shutting down the software isn’t good for the device.
Meanwhile, your phone *should* be updating its power remaining referral tables based on the current data so that yout accuracy should be more up to date in the future.
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