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Samsung Galaxy S25 Ultra Charging Speed Test: Original Samsung 45W Charger

Samsung Galaxy S25 Ultra 45W Charging Speed Test

Samsung Galaxy S25 Ultra Charging Speed Test: Original Samsung 45W Charger

This article documents a real-world charging test of the Samsung Galaxy S25 Ultra using the original Samsung 45W charger. The battery increased from 16% to 91% between 8:24 AM and 9:10 AM.

The purpose of this test is to calculate the average charging speed, estimate battery gains over different time periods, and calculate the estimated time required to reach a full charge.

1. Charging Test Details

Test Detail Result
Smartphone Samsung Galaxy S25 Ultra
Charger Original Samsung 45W charger
Starting time 8:24 AM
Starting battery level 16%
Ending time 9:10 AM
Ending battery level 91%
Total charging duration 46 minutes
Total battery gained 75 percentage points

2. Charging Speed Calculation

The battery increased from 16% to 91% in 46 minutes.

Step 1: Calculate the battery percentage gained.

91% - 16% = 75 percentage points

Step 2: Calculate the average charging speed.

75 / 46 = 1.63 percentage points per minute

Based on these measurements, the phone gained an average of approximately 1.63 percentage points per minute, or approximately 16.30 percentage points every 10 minutes.

This is an average calculated across the entire test. It does not mean that the battery increases at exactly the same rate every minute.

3. Estimated Battery Percentage at 10-Minute Intervals

The following estimates use the average charging speed calculated from the recorded start and end battery levels.

Time Elapsed Time Estimated Battery
8:24 AM 0 minutes 16.0%
8:34 AM 10 minutes 32.3%
8:44 AM 20 minutes 48.6%
8:54 AM 30 minutes 64.9%
9:04 AM 40 minutes 81.2%
9:10 AM 46 minutes 91.0%

Only the starting and ending battery levels were recorded. Intermediate values in this table are mathematical estimates, not actual measurements.

4. Battery Percentage Gained Over Different Time Periods

Charging Duration Estimated Battery Gained Estimated Battery if Starting at 16%
5 minutes 8.2% 24.2%
10 minutes 16.3% 32.3%
15 minutes 24.5% 40.5%
20 minutes 32.6% 48.6%
25 minutes 40.8% 56.8%
30 minutes 48.9% 64.9%
35 minutes 57.1% 73.1%
40 minutes 65.2% 81.2%
45 minutes 73.4% 89.4%
46 minutes 75.0% 91.0%

5. Estimated Time to Reach Different Battery Levels

Starting from 16% at 8:24 AM, the following table estimates how long it would take to reach selected battery percentages at the measured average charging speed.

Target Battery Estimated Time Required Estimated Clock Time
20% 2 minutes 27 seconds 8:26 AM
30% 8 minutes 36 seconds 8:33 AM
40% 14 minutes 44 seconds 8:39 AM
50% 20 minutes 53 seconds 8:45 AM
60% 27 minutes 1 second 8:51 AM
70% 33 minutes 9 seconds 8:57 AM
80% 39 minutes 17 seconds 9:03 AM
90% 45 minutes 27 seconds 9:09 AM
91% 46 minutes 9:10 AM
100% Approximately 51 minutes 31 seconds Approximately 9:16 AM

The clock times are rounded to the nearest minute. The full-charge estimate is a projection and was not measured in this test.

6. Estimated Charging Time from 0% to 100%

The average rate measured in this test can also be used to calculate a theoretical charging duration from an empty battery to a full battery.

Battery Level Estimated Time from 0%
25% Approximately 15 minutes
50% Approximately 31 minutes
75% Approximately 46 minutes
100% Approximately 61 minutes 20 seconds

Important: These figures assume a constant charging speed. A real charging session may take longer because charging power changes with battery level, temperature, and charging conditions. This test did not measure a complete 0%-to-100% charging cycle.

7. Samsung's Official 45W Charging Claim

Samsung's published specifications for the Galaxy S25 Ultra state that the phone can reach up to 65% battery in around 30 minutes when using a compatible 45W adapter under the specified test conditions.

Official reference: Samsung Galaxy S25 series announcement and specifications .

My test recorded a gain of 75 percentage points in 46 minutes, averaging approximately 16.3 percentage points every 10 minutes. However, this is not a direct comparison with Samsung's official result because the starting battery level and test conditions differ.

8. Factors That Can Affect Charging Speed

  • Screen usage: Gaming, video playback, and other demanding tasks can consume power while the phone charges.
  • Temperature: The phone may reduce charging power if the battery or device becomes too hot.
  • Battery percentage: Charging speed can decrease as the battery approaches a high state of charge.
  • Charging cable: The cable must support the required charging mode and power delivery.
  • Charging settings: Fast charging must be enabled where applicable, and the phone must recognize a compatible charger.
  • Background activity: Applications and background processes can affect power consumption during charging.

Samsung provides additional guidance in its official fast-charging support information .

9. Final Verdict

In this charging test, the Samsung Galaxy S25 Ultra increased its battery level from 16% to 91% in 46 minutes using the original Samsung 45W charger.

The battery gained 75 percentage points, giving an average charging rate of approximately 1.63 percentage points per minute. Based on this average, charging from 16% to 100% would take approximately 51 minutes and 31 seconds if the same rate continued.

This does not establish the actual full-charge time, since charging speed can decrease near 100%. A complete charging test would be needed to measure the real duration from 0% to 100%.

For more reliable results, repeat the test with the screen off, a cool phone, the same charger and cable, and battery readings recorded at regular intervals.

Test conclusion: This test provides a useful real-world snapshot of Samsung Galaxy S25 Ultra charging performance with the original Samsung 45W charger. The measurements are specific to this charging session and should not be treated as guaranteed charging times for every situation.

Test Summary

  • Starting battery: 16%
  • Ending battery: 91%
  • Charging duration: 46 minutes
  • Battery gained: 75 percentage points
  • Average charging speed: 1.63 percentage points per minute
  • Estimated time from 16% to 100%: approximately 51–52 minutes
  • Estimated time from 0% to 100% at the same average rate: approximately 61 minutes

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