A Galaxy S23, S23+ or S23 Ultra is now over three years old, so a phone that drains fast has two realistic explanations: an app or update using the power, or a battery that has worn out after years of charging. Samsung's order is the same for both: install the latest software and update every app, close running apps and run Device care, Optimize now, turn off notifications you do not need, use dark mode and stop unused radios. If none of that helps, run the Samsung Members battery test and price a replacement: Samsung's US screen module repair replaces the screen, frame and battery together and is listed at $209, $249 and $319 for the S23, S23+ and S23 Ultra.
Differential
Likely causes of “Samsung Galaxy S23 family battery drains too quickly”, and how to tell them apart
- 1
A worn battery after years of charging
What separates it Drain is even across apps, the phone drops quickly from 30 percent or shuts off early
How to confirm Run Samsung Members diagnostics under Support; a poor battery result points to replacement, which Samsung's screen module repair includes
- 2
One app using the phone in the background
What separates it One app dominates the battery list and background time exceeds screen time
How to confirm Put apps you rarely use to sleep under Background usage limits in Device care and compare tomorrow
- 3
5G keeping two radios active
What separates it Drain is worst on a 5G plan and the phone runs warm while browsing
How to confirm Samsung says a 5G phone also keeps a 3G or LTE connection alive; compare an hour on Wi-Fi with an hour on LTE
- 4
A restore or update still running
What separates it The phone is warm and drains fast for a few days after a big update or after moving data
How to confirm Samsung says restoring large amounts of data raises battery use and temperature; keep the phone on Wi-Fi and charger until it finishes
- 5
A small battery on the base S23
What separates it The S23 needs charging sooner than an S23 Ultra on the same use
How to confirm Wikipedia lists 3,900 mAh for the S23, 4,700 mAh for the S23+ and 5,000 mAh for the Ultra, so part of the difference is capacity
Before you touch a setting
Record this first — changing settings destroys the evidence
- Which of the three models you have, the model number from Settings, About phone and the One UI version
- The top three entries under Settings, Battery and whether the drain is idle, on 5G or on Wi-Fi
- Whether the phone shuts off at a moderate percentage, and the Samsung Members battery test result
- Whether the phone also runs hot or charges slowly at the same time
Try in this order
0 of 7 completedUpdate the software and the apps
ReversibleOpen Settings, Software update, Download and install, and update the apps in the Galaxy Store and Play Store. Samsung lists these first because a bug or an old app version is a common cause of drain.
Close apps and run Device care
ReversibleClose everything from Recents, open Settings, Device care and tap Optimize now. Samsung says Device care may report the phone is already in good condition.
Limit background apps and notifications
ReversibleUse Background usage limits under Device care to put rarely used apps to sleep, and switch off notifications you do not need under Settings, Notifications.
Reduce always-on features
ReversibleTurn on dark mode under Settings, Display, and switch off auto sync, Wi-Fi, Bluetooth and GPS when unused. Consider the Light performance profile under Device care.
Test 5G against Wi-Fi
ReversibleSamsung says a 5G phone keeps a second network link alive, so compare drain on Wi-Fi and on LTE for an hour each before blaming the battery.
Run the battery test
ReversibleOpen Samsung Members, tap Support and run the battery diagnostic. On a phone this age a poor result is the likeliest answer.
Price the replacement
ReversibleAsk a Samsung walk-in center or mail-in service about the screen module repair, which replaces the screen, bezel and battery; the US list gives $209, $249 and $319 for the three models.
Model-specific
What is true of this model and not of its siblings
- Battery and charging by model
- Wikipedia lists 3,900 mAh (S23), 4,700 mAh (S23+) and 5,000 mAh (S23 Ultra), with 25W Super Fast Charging on the S23, 45W Super Fast Charging 2.0 on the S23+ and Ultra, and Qi wireless charging at 15W on all three.
- Chip
- The Snapdragon 8 Gen 2 for Galaxy powers all three phones, with 8 or 12 GB of LPDDR5X RAM, so battery differences between the models come from capacity and the display, not a regional chip.
- Part numbers
- Samsung asks for the SM- model number from Settings, About phone rather than a part number. Its chargers are rated 25W and 45W for this family.
- Tools and supplies
- The Battery and Device care screens, a Samsung charger and cable to compare, a flashlight for the port and a soft, dry cloth. No screwdriver is needed and the phone should not be opened.
- Repair cost
- Samsung's US price list gives screen module repair, which includes a new battery, at $209 (S23), $249 (S23+) and $319 (S23 Ultra), and screen-only repair at $174, $194 and $259. The prices are suggested and vary by region or store.
Stop boundary
When this stops being a self-service repair
- !If the phone loses more than a quarter of its charge overnight on Wi-Fi after Optimize now and a restart, run Samsung Members diagnostics and contact Samsung support
- !If the back bulges or the phone is hot while idle, stop using it and visit a Samsung walk-in service center the same day
- !If the battery test shows a poor result, book the screen module repair, which Samsung's US list prices at $209 (S23), $249 (S23+) and $319 (S23 Ultra) and which includes a new battery
Evidence ledger
Sources behind this answer
What raises temperature and what to do.
Per-model battery, charging, chip, storage, Wi-Fi and display, citing Samsung and reviews.
Samsung's suggested US screen and screen module repair prices by model.
Exact questions
Common questions
How big is each S23 battery?+
Wikipedia lists 3,900 mAh for the Galaxy S23, 4,700 mAh for the S23+ and 5,000 mAh for the S23 Ultra.
Does Samsung replace the S23 battery on its own?+
Samsung's US price list shows a screen module repair that replaces the screen, bezel and battery together: $209 for the S23, $249 for the S23+ and $319 for the S23 Ultra. It also lists screen-only repairs at $174, $194 and $259.
Is the S23 affected by the July 2026 update complaints?+
9to5Google and Phandroid named the S24 and S25 series, especially the Ultras, and did not name the S23; treat unexplained drain as a background-app question first.
Did a software update cause this?+
Samsung has shipped more than one update aimed specifically at battery and charging bugs that surfaced after a One UI upgrade, so a phone that drained normally before a recent update and worse after it should be checked for a newer patch under Settings, Software update, before anything else on this page.
Why does my S23 shut off at 20 percent?+
That pattern usually points to a worn battery; run the Samsung Members battery test and price the module repair.
Do all S23 models use the same chip?+
Wikipedia lists the Snapdragon 8 Gen 2 for Galaxy on the S23, S23+ and S23 Ultra worldwide, so there is no Exynos version to compare.