A warning pops up, saying it's going to display battery percentage incorrectly, and that's okay. Step 3: Hit the "Quick Start" button at the bottom.Step 2: Open up your stock phone dialer, and enter the following (I'm sure you all have seen it everywhere else by now): *#0228# (This allows you access to view the battery's health and voltage menu, with the ability to delete the phone's battery information (only deletes the calibration information!), which will be replaced).The LED at the top should light up green, and display text saying "Fully Charged" at the bottom. What's the alternative? I'm not sure at all, and for that, I apologize for not being able to help. *NOTE: This process only works for non-Verizon Samsung devices, as I was made aware that Verizon (for some stupid reason) disables your access to Samsung's servicing codes. Now it would be simpler if the FuelGauge system was able to compensate and calibrate on its own, but you have to do it manually if you run into this issue. It is the software that misinterprets/"forgets" the capacity. *NOTE: The Li-Ion battery never forgets its capacity, unlike the previous generation nickel-based batteries. Some may find their percentages to be over or under-estimated, which in turn causes these random percentage drops. But everyone's battery usage is different. Over time, due to the nature of Li-Ion, the battery does degrade, and the phone will do its best to account for that degradation*. Samsung has a software system in place called FuelGauge, which creates the file that your phone uses to calibrate and guess the battery's current and remaining capacity, and provides estimates off that. Samsung has its own process of doing that, and it is NOT simply discharging and recharging your phone. THIS is the one we need to fix/reset in order to get your phone to display the capacity correctly. There are two flags-one describes the maximum battery charge, and the second flag describes the lowest value (0%) charge. That is just how Lithium-Ion batteries work, due to the nature of their construction and composition.Īnd the second one is within your phone's software, which can be described as so. If it gets FULLY discharged (as in the phone reaches 0%, known as a deep discharge, and is never charged again over days, weeks, or even months), that battery is then damaged, and can no longer be recharged. This is in order to protect the battery, and allow it to recharge. Essentially, when the voltage of your battery drops to or below a certain amount, that is when your phone displays 0% and shuts off. The one within the battery you primarily need to know is the voltage cut off. One is with the battery itself, and the second is within your phone's software, giving you your percentage reading. First off, you have to know that there are TWO battery management systems put in place in your phone. I have seen numerous posts with varying details about calibrating their phone's battery, and some do get close, but are off by a little bit, and I am here to give y'all the correct process. If you want an explanation/justification, read the spoiler. Some users even noticed the battery steadily drop at a fast rate AFTER plugging in their phone to charge, and I have found that as well. The issue I've been having is the same as I've read everywhere else: Battery discharges normally to X percent (most notably within the 20~25% range, but some others have said even 30%), then it suddenly discharges to 0% and switches off. Heya! This is my first post here (as well as all of Reddit) joined primarily to see how everyone else's Galaxy S9's are holding up over the years, plus how to get the darn battery problems fixed.
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