The Galaxy S24 battery capacity is 4000 mAh typical, which is the figure Samsung uses in its specification list. Wired charging is rated at 25W, and the phone also supports wireless charging. Samsung does not publish a watt hour figure in the same list, so any Wh number you see is a calculation.
Do not mix this phone up with the bigger models in the same range. The S24+ and the S24 Ultra carry larger packs, covered in the table below. If you are here to buy a replacement pack, the model number of your phone matters more than the name, and the next sections show where to read it.
Quick facts
Step by step
Open Settings and search for battery
Open Settings and type battery in the search bar. Menu names change with the software version, so use the search result that mentions battery information or battery care.
Note the model number of the phone
Go to Settings, then About phone, and write down the model number. It begins with SM-S921 for this phone, and the ending letters show the market variant.
Compare the charge drop over one normal day
Unplug at full charge, use the phone as usual and note the percentage at night. Repeat for two or three days to see the pattern, not one bad day.
Ask the service centre for a battery test
If the phone shuts down early or the charge falls fast, ask the service centre to test the pack. A test result is more reliable than an app score.
What the S24 battery capacity figure means
Samsung lists 4000 mAh as the typical capacity of the Galaxy S24. Typical is an average taken over many battery samples, and it is the figure shown on maker pages and product boxes. The rated (minimum) capacity is the lower figure that the maker guarantees for each pack. Your own phone may print or show a slightly different value, so do not treat 4000 as an exact reading.
S24 energy: 4000 mAh multiplied by its cell voltage, then divided by a thousand. Samsung does not state the voltage in its headline list, so take 3.9 V as an assumption. That gives about 15.6 Wh. Use it only to compare with other phones on the same assumption.
Galaxy S24 next to its nearest models
| Phone | Typical capacity | Wired charging |
|---|---|---|
| Galaxy S24 | 4000 mAh | 25W |
| Galaxy S24+ | 4900 mAh | 45W |
| Galaxy S24 Ultra | 5000 mAh | 45W |
| Galaxy S23 | 3900 mAh | 25W |
| Galaxy S24 FE | 4700 mAh | 25W |
The S24 has the smallest pack in its own range, and that fits its smaller body. The step up to the S24+ is close to a thousand mAh. If battery life is your first need, compare it with what other phones offer on the 5000 mAh phones page, and see the 6000 mAh phones page for larger packs.
How long the S24 battery lasts in daily use
A 4000 mAh pack is modest by present Android standards, but the phone does more with it than the number suggests. S24 screen time depends on its chip, 6.2 inch adaptive display, signal, brightness and apps. Games, video calls and a weak network drain it faster than messaging and reading.
Most S24 owners get a full day of mixed use, though a heavy day may need an evening top up. Your result will differ from another owner's, so judge by your own three-day pattern rather than a review figure.
A customer with an S24 said the phone reached 30 percent by late afternoon. The technician found auto brightness off, the screen at the highest refresh rate and a video app syncing in the background. After those settings were changed, the phone reached the night with about 25 percent left, and no part was replaced.
Charging speed and what to expect
The charging rate is up to 25W wired. That is a ceiling, not a constant: the speed drops as the pack fills, and a slow cable or a low-watt charger will cut it further. Wireless charging works too, but it is slower and runs warmer, so it suits an overnight desk charge better than a quick top-up.
The box may not include a charger, so check what came with your unit. Use a charger and a cable that match the phone's rating. A worn cable that heats at the plug should be thrown away. For deeper reading on what a mAh number does and does not tell you, see battery capacity explained.
How to check the health of the S24 battery
Whether the phone shows a battery health value depends on the software version installed. Search for battery in Settings and look for a battery information page. If your version has none, rely on behaviour: early shutdowns, a charge that falls quickly and a back that runs hot while idle. The general method is explained in how to check battery health.
| S24 symptom | Probable cause | What an S24 owner should do |
|---|---|---|
| Charge drops quickly through the day | Apps, settings or a worn cell | Read why the charge drains fast, then test |
| S24 turns off with charge left | Tired S24 cell under load | Book an S24 battery test |
| S24 screen lifts or back bulges | Swollen cell | Unplug the S24 and visit Samsung service today |
An S24 cell that swells, leaks, smells odd or runs very hot may catch fire. Unplug the S24 as soon as you notice, keep it straight and unsqueezed, and move it somewhere cool. Cheap S24 replacement cells often print invented capacities, so allow only a cell fitted by a trusted technician.
Replacing the S24 battery
The Galaxy S24 has a sealed body, so the back should be opened by Samsung's own service network or a workshop you trust. Tell the counter the exact name and the model number shown under About phone. The S24 cell code is on its label, so let the technician match it to the part before fitting. Official support options are at the Samsung India support page.
After fitting, the capacity should be close to the original, the phone should charge normally and the back should sit flat. Sealed phone fitting is covered in our swap guide, and other Samsung codes are in our Samsung and Motorola list.
Ask to see the old S24 label before it is discarded, and photograph its code and capacity.
Looking after a 4000 mAh pack
On an S24, warm conditions and long hours full do more harm than most other habits. Remove a thick S24 cover while charging if it warms, and avoid charging in sun or under a pillow. If your software offers a charge limit in the battery settings, it can help for an overnight routine.
Do not wait for the phone to hit zero every time. Plugging in between 20 and 80 percent when it is convenient is gentler on the cell. Skip apps that promise to boost or repair the battery, since no app can add capacity.
Frequently asked questions
What battery capacity does the Samsung S24 have?
The Galaxy S24 is listed at 4000 mAh typical. The rated (minimum) value is a little lower. Wired charging is up to 25W.
Is the S24 battery 4000 mAh or 3900 mAh?
The headline figure is 4000 mAh typical. The Galaxy S23 is the one listed at 3900 mAh, so the two numbers can get mixed up. The rated value of your own pack may be lower than 4000.
How many watt hours is the S24 battery?
Samsung does not give it in the main specification list. At an assumed 3.9 V, 4000 mAh works out to about 15.6 Wh. Treat it as an estimate.
Does the S24 battery last a full day?
For most people with mixed use, yes. Heavy gaming, video calls, weak signal and a bright screen can bring it down by evening.
Can I replace the S24 battery myself?
Samsung advises against it. The S24 is sealed and its cell is glued in. A service centre can open it safely and match the code.
Is the S24 Ultra battery the same as the S24?
No. The S24 Ultra is listed at 5000 mAh and the S24+ at 4900 mAh. Their packs do not fit the S24.