Introduction
As the iterative work of the S series after ten years of hard work, the Samsung Galaxy S25 Ultra not only continues the top configuration genes of the "Android King", but also achieves breakthroughs in lightweight body, screen display and AI interactive experience, becoming a new benchmark in the field of straight-screen flagships.
It is equipped with Snapdragon 8, 6.9-inch 2K AMOLED screen, 5000mAh battery, and supports 45W wired fast charging. Let's follow ChargerLAB to see the charging performance of Samsung Galaxy S25 Ultra.
Product Appearance
The front of the box has a black-and-white silhouette of the phone and S-Pen, and Galaxy S25 Ultra is printed on the bottom.
Specification information, S/N, IMEI numbers, etc. are posted at the bottom of the box.
The box contains the Samsung Galaxy S25 Ultra, a dual USB-C cable, and some documents.
The Samsung Galaxy S25 Ultra features titanium frames and a 6.9-inch Dynamic LTPO AMOLED 2X display with a resolution of 1440 x 3120, a refresh rate of 120Hz, and Corning Gorilla Armor 2 glass. It is equipped with Qualcomm Snapdragon 8, up to 16GB RAM and 1TB storage.
The camera module has four cameras, from top to bottom: 50-megapixel ultra-wide-angle, 200-megapixel wide-angle, 50-megapixel telephoto, and a 10-megapixel lens on the right.
The camera is raised, so you need to pay more attention to it in daily use.
The power button and volume button are both on the right side.
The bottom has a SIM card slot, USB-C port, microphone, speaker, and S-Pen. The USB-C port is USB 3.2 Gen 1.
The S-Pen adopts a push-to-pop design, regardless of the front or back.
When the S-Pen is pulled out, you can call out related apps directly by setting the shortcut key on the side of the S-Pen. When the pen tip is 10mm away from the screen, you can see the cursor track of the pen tip on the screen, and the cursor disappears when it is away.
The length of the phone is about 162.9 mm (6.41 inches).
The width is about 77.71 mm (3.059 inches).
The thickness is about 8.21 mm (0.32 inches).
The weight is about 219.5 g (7.74 oz), which is about 14 g lighter than the S24 Ultra.
The dual USB-C cable is made of TPE and has a smooth surface. Secure with paper shells.
The connectors and the cable are thickened to be more resistant to bending.
ChargerLAB POWER-Z KM003C shows it doesn't have an E-marker chip.
The length of the cable is about 1 m (3' 3.37'').
Compatibility Test
Next, let's do the charging compatibility test.
Original Charger
Charge with the Samsung 65W three-port charger with the original 3A cable, the power is about 13.44V 2.95A 39.58W.
Samsung chargers were tested one by one, and all were paired with the original 3A dual USB-C cable. The maximum voltage can reach 13V. Except for the 25W charger power limit, the power of the rest of the Samsung chargers is above 40W.
The power of chargers above 45W can reach 40W, and the actual power of a 25W charger is close to 20W.
Third-party Chargers
We also used a variety of third-party chargers during the test. Let’s take a look at the results.
Charge with the AOHi 140W charger with the original 3A cable, the power is about 13.56V 2.99A 40.51W.
The third-party chargers tested can generally reach a voltage of around 9V or 13V, and the power is between 14 and 41W.
We have compiled the test results into a bar chart. There are no compatibility issues. Most of the power is above 20W. For chargers that support the PD protocol, the power is generally around 23W, and chargers that support the PPS protocol have a higher power, between 25-41W, with a maximum of 41.77W, which has good compatibility.
Power Banks
The voltage of most power banks can reach 9V, while those that support high-power PPS can reach 13V, with higher power.
Compiled the test results into a bar chart. There are no compatibility issues. There are three power banks that can reach a power of about 39W, and the power of the rest is about 23W or 15W.
Full Charging Test
We use the Samsung 65W three-port charger with the original 3A cable to fully charge the Samsung Galaxy S25 Ultra. And put them into a 25°C (77℉) thermotank throughout the test.
At first, the voltage is around 14V. The charging curve can be divided into six parts. The power is around 41W for the first 8 minutes. Then, the power drops to 34W and 14W. Next the power rises to 30W and then drops to 22W. After that, the voltage drops from 14V to 9V. It takes 1 hour and 22 minutes to be fully charged and the voltage drops to 5V.
We also turn it into another curve. The Samsung 65W three-port charger can charge the Samsung Galaxy S25 Ultra to 50% in 21minutes. And it can reach 80% in 37 minutes and 100% in 1 hour and 22 minutes.
Temperature Test
We also recorded the highest temperature on the front and back after charging for 10 minutes, 20 minutes, and 30 minutes.
10 minutes Charging
After 10 minutes, the maximum temperature on the front is 38℃ (100.4 ℉).
The back is 40.3℃ (104.54 ℉).
20 minutes Charging
After 20 minutes, the maximum temperature on the front is 36.9℃ (98.42 ℉).
The back is 39℃ (102.2 ℉).
30 minutes Charging
After 30 minutes, the maximum temperature on the front is 32℃ (89.6 ℉).
The back is 33.7℃ (92.66 ℉).
We also turn it into a bar chart. During charging, the temperature on the back is slightly higher than that on the front. At the tenth minute, the temperature on the back was the highest, reaching 40.3℃ (104.54 ℉), and the power was about 34W. At the 30th minute, the temperature on the back was only 33.7℃ (92.66 ℉), and the power was about 22W, showing excellent temperature control.
Summary of ChargerLAB
Samsung Galaxy S25 Ultra is equipped with a 6.9-inch Dynamic AMOLED 2X high refresh screen with a resolution of 3120x1440px. It is equipped with Qualcomm Snapdragon 8 and integrated with Galaxy AI.
Samsung chargers above 45W and high-power PPS third-party chargers can reach a voltage of about 13-14V, and the maximum power can reach about 41W. Most of the other third-party chargers are also above 20W. Samsung S25 Ultra adopts a high-voltage, low-current charging solution, and its charging compatibility is similar to that of S24 Ultra. Using Samsung 65W three-port charger to charge it, it takes 21 minutes to charge to 50%, and it takes 1 hour and 22 minutes to fully charge. The highest temperature during the charging process is 40.3℃ (104.54℉), but the subsequent temperature drops significantly. The temperature after charging for half an hour is only about 33℃, and the heat dissipation performance is excellent.
In general, as Samsung's new generation flagship model, the Samsung Galaxy S25 Ultra has reached the industry's top standards in terms of camera, screen, performance, and workmanship, and its performance is impeccable. Compared with the previous generation, it is lightweight. The 5000mAh battery and 45W fast charging give it a good battery life.
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