The Galaxy S23+ carries a 4,700 mAh battery, a comfortable size when it was new in 2023, so drain on one today means either a worn cell after more than three years of charging, or something running that should not be. Start with the battery's health in Samsung Members, then the Battery page for the app responsible, then the One UI build. If the cell has failed, Samsung's US price for the S23+ screen module repair, which includes a new battery, is $249, against $194 for the screen alone, so prove the battery is the cause before you book.
Differential
Likely causes of “Samsung Galaxy S23+ battery drains too quickly”, and how to tell them apart
- 1
A cell worn by three years of charging
What separates it Percent falls in steps, the phone shuts off at 20 to 30 percent, or it dies quickly in cold weather
How to confirm Samsung Members, Get help, Phone diagnostics, Battery status; a poor result means replacement, not settings
- 2
A One UI update that is still settling
What separates it Standby drain began the day One UI 8 or 8.5 installed, with warmth overnight
How to confirm Install the newest patch, restart, and watch standby for up to two weeks, which was the advice on Samsung's forums
- 3
One background app
What separates it One app in Battery usage dwarfs the rest and its time is background
How to confirm Settings, Battery, Background usage limits: put that app to sleep
- 4
A large 120 Hz screen
What separates it Screen on time is the top bar on a 6.6-inch panel
How to confirm Settings, Display, Motion smoothness: Standard holds 60 Hz and saves a visible slice of the day
- 5
Long gaming or hotspot sessions
What separates it Drain jumps on days you tether or play
How to confirm Check Battery usage for Hotspot or the game; switch the hotspot off when idle
Before you touch a setting
Record this first — changing settings destroys the evidence
- The model number under Settings, About phone (SM-S916U for the US S23+)
- One UI version and security patch date
- The Battery status result from Phone diagnostics
- How much it loses overnight with Wi-Fi on and nothing running
Try in this order
0 of 6 completedInstall the newest patch
ReversibleSettings, Software update, Download and install, then restart. Several complaints after One UI 8 were fixed by later patches.
Open the usage breakdown
ReversibleSettings, Battery, Battery usage. Tap the top app and note whether the time is foreground or background.
Put the offender to sleep
ReversibleIn Background usage limits, add the app to Sleeping apps or Deep sleeping apps.
Try Standard motion smoothness
ReversibleSettings, Display, Motion smoothness. A 6.6-inch 120 Hz panel is the biggest draw on this phone.
Wipe the cache partition
ReversiblePower off, hold volume up and the side key for Recovery and choose Wipe cache partition. Files stay and stale system caches are rebuilt.
Prove the cell before paying
ReversibleSamsung Members, Get help, Phone diagnostics, Battery status. Only a fail justifies the repair.
Model-specific
What is true of this model and not of its siblings
- Where the S23+ sits
- A 4,700 mAh cell is 20 percent larger than the S23's 3,900 mAh and 6 percent smaller than the Ultra's 5,000 mAh, so it lasts about a day for a typical new phone and noticeably less once worn.
- Repair costs from Samsung's US list
- Screen only $194; screen module with a new battery $249.
- Why the S23+ is the easy one to blame on software
- With 4,700 mAh it managed a long day when new, so owners who now see drain by early evening are usually seeing either a worn cell or a particular app. That makes the usage chart more informative here than on the 3,900 mAh S23, where small drains show up everywhere.
- Tethering and hotspot
- The S23+ is a popular hotspot phone because of its larger battery; an hour of tethering can cost a fifth of a charge, so a hotspot left on overnight explains many odd mornings.
Stop boundary
When this stops being a self-service repair
- !If Phone diagnostics says the battery is worn, book the screen module repair, priced at $249 for the S23+ on Samsung's US list, since the battery is not sold separately
- !If the phone loses a quarter of its charge overnight in Safe mode, take it in
- !A swollen case or a phone hot at idle is a same-day service visit
Evidence ledger
Sources behind this answer
Exact questions
Common questions
How big is the Galaxy S23+ battery?+
4,700 mAh, between the S23's 3,900 mAh and the S23 Ultra's 5,000 mAh, with 45 W wired and 15 W wireless charging.
How much does an S23+ battery replacement cost?+
Samsung's suggested US price for the S23+ screen module repair, which includes the battery, is $249; the screen-only price is $194. Confirm locally.
Why is my S23+ draining after One UI 8?+
Samsung paused that rollout on the S23 series in 2025 after battery complaints. Install the next patch and allow up to two weeks.
Will an S23+ be updated for long?+
Samsung's promise is four OS upgrades and five years of security patches for the S23 line.
Should I replace the battery or the whole phone?+
If Phone diagnostics shows a worn cell and the phone is otherwise fine, the $249 screen module repair is far cheaper than a new phone, and the S23+ will keep getting security patches from Samsung for several more years.
Can leaving the phone on a wireless charger drain or wear the battery?+
Overnight Qi charging at 15 W adds heat, and heat shortens the life of a cell. Using Protect battery on Basic or Maximum limits the time at full charge.