There's no single "magic code" to dramatically extend battery life, but codes like *#9900# (for Samsung) can reset battery stats to help recalibrate usage, while *#0228# (Samsung) offers battery info, but real longevity comes from settings like Battery Saver/Low Power Mode, reducing screen brightness, limiting background apps, disabling unnecessary connectivity (Wi-Fi, Bluetooth, GPS), and avoiding extreme temperatures, notes Google Help, The One Solution, and Super B batteries.
🔋 Unlock the Secret Code for Extended Battery Life on Samsung Phones! ⚡️ Try this trick: Charge to 100%, enter *#0228#, tap Quick Start, press OK. Dial *#9900# for Battery Stat reset! Share with friends & boost your battery!
Stretch a low battery
You can also try Batterystas reset, to do so : Open your phones dialer type *#9900# (autobleckes needs to be turned off and default Samsung's phone app needs to be used) than scroll until you see batterystats reset press on it. Also you can put unused apps to sleep to save more battery.
The 20/80 battery rule suggests keeping lithium-ion batteries (in phones, EVs, etc.) charged between 20% and 80% for daily use to slow degradation and extend overall lifespan, avoiding the stress and heat from frequent full charges (100%) or deep discharges (near 0%). While not strictly necessary for short-term use, following this guideline minimizes battery strain, leading to better long-term health, though modern devices have built-in optimization features.
However, staying at 100% for extended periods still contributes to chemical wear. If you keep your phone plugged in at 100% day after day, expect shorter battery life after a few months. Some brands like Apple and Samsung now offer features to limit charging beyond 80% during idle hours.
Charge to 80% for daily use: Maintaining an 80% charge preserves battery longevity, reduces voltage stress, and provides sufficient range for most commutes. Use 90% or 100% selectively: Charge to 90% for longer trips and 100% only when necessary, completing the drive soon after to avoid prolonged high-voltage exposure.
Dialing *#7353# on a Samsung phone opens the Quick Test Menu, a hidden diagnostic tool that lets you quickly test various hardware components like the speaker, vibration motor, sensors (accelerometer, light), touchscreen, camera, and display colors, all through simple, one-tap options for basic troubleshooting. It's a handy way to check if parts of your phone are working without needing complex apps, though some codes may vary or not work on newer models.
How to Calibrate Your Battery
Charging to 100% is okay occasionally—like before a long trip, in cold weather, or for BMS recalibration—but doing it too often can speed up battery wear. Sticking to moderate charge levels is a simple way to maintain performance and reduce long-term degradation.
*#2663#- This is the Samsung touchscreen test code. It gives you access to the Touchscreen Firmware Update menu, which can help fix touchscreen issues.
Open the dialer and type *#9900#. Scroll down and tap on the Batterystats reset option to erase current battery usage data and restart the learning process.
Typing *#0*# (star-hash-zero-star-hash) into the phone dialer on a Samsung device opens a hidden General Test Mode, a secret diagnostic menu used for checking hardware components like the screen (touch, color), sensors, speakers, cameras, and vibration. It's a valuable tool for users to self-diagnose issues or verify a device's functionality, especially when buying a used phone, as it allows you to test functions like touch responsiveness, RGB colors, and sensor accuracy.
Make sure your phone is in 4G mode (4G icon on your phone). Dial the code *#0011# and press the “Call” button. This will take you to the Samsung Galaxy's service menu.
Get software and hardware info (*#12580*369#)
If you want to find your phone's software and hardware information, dial *#12580*369# to get the details instead of navigating through the Settings menu.
Code to check for call forwarding number: *#67#
This code informs you about the calls and messages sent to other numbers when you're on another line or reject the call. The response you receive when you enter this code will reveal if someone is after you.
The * * 4636 * * Code in phone is a secret code that helps unlock the hidden menu in an Android phone. It technically acts as a diagnostic tool that helps you to check various details on your phone like IMEI number, data consumption on cellular mode and Wi-Fi.
Carrier Reset Settings: ##72786# and ##873283# What is a Carrier Reset? A carrier reset can help resolve data connection problems by re-provisioning your phone onto the wireless network.
You can also dial ##4636## to access the "Testing" menu. Within this, navigate to “Battery Information” to view real-time battery stats including voltage, temperature, and charging status.
The 80/20 battery rule suggests keeping lithium-ion batteries (like in phones, laptops, EVs) between 20% and 80% charge for daily use to maximize long-term health and lifespan, avoiding the stress of full discharges (below 20%) and prolonged full charges (above 80%) that degrade battery chemistry faster, though modern devices have built-in optimizations. It's a guideline, not a strict law, balancing battery longevity with convenience, as charging to 100% or dropping below 20% is fine for occasional use.
While keeping your phone between 20% and 80% charge can extend battery lifespan, occasional full charges are not detrimental. In essence, today's smartphones are designed to handle 100% charging safely, and adhering to good charging practices can help maintain battery health for the long term.
Depending on your device, you can: