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Galaxy S9 Disable Fast Charging

How to Disable Fast Charging on the Samsung Galaxy S9

Most smartphones these days come with some type of fast charging but few actually have a way to turn it off. This isn’t the case for Samsung though and we can disable the Galaxy S9 and Galaxy S9+ fast charging feature by digging through the settings menu.

Smartphones has pushed battery technology to its limit over the last decade with lithium ion being the go-to material for major companies. Batteries will always degrade over time when used how you normally would but there are multiple ways in which we can reduce the wear. Doing so will keep our smartphones lasting longer and keep the batteries healthy longer than those who ignore these tips. One of the tips is to not keep the charging cable in the smartphone for an excessive amount of time.

This is interesting as a lot of people will plug in their smartphone at night and set it on their side table before they go to bed.

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Fast charging technology will charge an entire battery in an hour and a half to two hours but it’s actually the charging times between 95 percent to 100 percent that does the most damage to the battery. So for 6 to 7 hours each night, the phone will charge up to 100%, then go down a percent or two before the charger kicks in again to bring it up to 100% with this repeating until we wake up.

Disabling the Galaxy S9 fast charging feature isn’t something that will eliminate this entirely, but it will reduce the amount of times that charging cycle happens.

Galaxy S9 Disable Fast Charging Tutorial

  1. Go into the Settings application
  2. Then tap on the Device Maintenance option
  3. Look at the bottom left and tap on the Battery icon
  4. Tap the 3-dot menu icon at the top right of the screen
  5. Choose the Advanced Options option in the drop down menu
  6. Then tap the Fast Cable Charging option to flip the toggle and disable it from working


While many have been begging smartphone companies to use bigger batteries in their devices, we’re seeing fast charging technology used to alleviate this pain point. The goal is to push as much power into the battery as quickly as possible (while still keeping things safe) when the battery is at 0%, as the battery percentage gets higher, the charge rate gets slower until we get to the 50% – 70% mark (it depends on the OEM).

It’s at this point when it will actually charge your device just like any other charger would. This is great for those last-minute charge sessions when you need to plug in the phone while you get ready to go out for the night but it’s more than useless at night when we have the phone plugged in while we sleep.

You can control the speed in which your smartphone charges by buying an additional charger that is limited to a regular (and safer) charging speed. I recommend the official Amazon 5W 1A charger but there are other reputable OEMs there as well.

Some have enjoyed the introduction of fast charging technology but there are others who believe smartphone companies have added this as a way to wear the battery out quicker. So, if you’re not a fan of the Galaxy S9 fast charging technology then you’ll be happy to hear that we can turn it off.

Galaxy S9 Disable Fast Charging Menu
There are a lot of features and pieces of information here but we want to access the Advanced Options page.

To do this, we need to dive into the Settings application and then tap on the Device Maintenance option. This will serve as a dashboard of sorts with a row of buttons at the bottom. We want to tap the Battery icon at the bottom left of the screen to go into the Battery section. From here, tap on the 3-dot menu icon in the top right corner and then tap on the Advanced Options choice that appears from the drop-down menu. This is where we find some interesting options for the battery of our Galaxy S9 and Galaxy S9+.

We want to ignore the top two options (as of writing this) and focus on the 3rd option in the list instead. You should see a Fast Cable Charging option with a simple toggle to the right and it should be enabled by default. Simply tap on the toggle itself, or the text option, and it will disable the Galaxy S9 fast charging technology all together. Once done, it doesn’t matter if you’re using a fast charger or not, the smartphone will only accept the normal amount of power that you would get from regular charging speeds.

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