1. Battery Capacity and Charging Technology of Samsung Galaxy S21
The Samsung Galaxy S21 features a non-removable Li-Po battery with a capacity of 4000mAh, similar to its predecessor, the Galaxy S20 from last year.
For this year's standard Samsung Galaxy S21 model, Samsung has reduced support to only 25W fast charging instead of the previous 45W. You can still charge the Samsung Galaxy S21 with a 45W charger, but it will no longer support fast charging. In addition, the convenient Qi 2.0 wireless fast charging technology at 15W power is even more convenient without the need for a charging cable, making it tidy and convenient.
The 4.5W reverse wireless charging feature turns your Samsung S21 phone into a power bank. Moreover, you can also share the phone's battery with other devices that support wireless charging, such as smartwatches or other phones. This is an incredibly useful feature.

2. Reviewing the Usage Time of Samsung S21 Phone
The S21 phone boasts features like a 120Hz display, 8K video recording capabilities, but with the same 4000mAh battery capacity as its predecessor, how does its usage time fare? Will it deliver impressive results or regress on the Samsung Galaxy S21?
According to the battery review of the S21 by GSMARENA, this year's Galaxy S21 has better battery life than the Samsung S20.
The Samsung S21 can handle 3G talk time for 27 hours and 30 minutes – a much higher result compared to both the S20+ with 21 hours and the S20 with 14 hours. For web browsing time, the S21 lasts for 10 hours and 57 minutes, which is not much different from the 10 hours and 48 minutes on the S20. The video playback time on the S21 is 15 hours and 10 minutes. Lastly, the average standby time of the Samsung Galaxy S21 can be up to 93 hours.

When examining the average usage time of the Samsung S21 phone, the results are quite promising at around 8 hours and 6 minutes. In comparison, the 5000mAh battery of the Galaxy S21 Ultra lasts for 11 hours and 43 minutes.

For 3D gaming tasks, the Samsung Galaxy S21 Ultra provides an experience lasting 7 hours and 9 minutes.

With such battery life, the Samsung S21 can easily meet users' needs for a full day of usage.
To achieve such good results on a 4000mAh battery, it's probably because the S21 this year has a new chipset for optimized performance, upgraded operating system,... Additionally, Samsung has equipped features to save power such as the adaptive screen feature automatically adjusting the screen refresh rate of the S21 from 48Hz to 120Hz, thereby optimizing the amount of battery usage.
3. Charging Speed of Samsung Galaxy S21 Phone
As introduced above, this year the charging power on the S21 has been reduced to only 25W compared to 45W on the Galaxy S20 series. However, the time to fully charge the S21 is still highly rated with the ability to fully charge the battery in just over 1 hour (specifically 68 minutes).

Thus, the Samsung Galaxy S21 is a phone with impressive battery life and very fast charging time. Moreover, the S21 also has powerful specifications, features, quality camera photography, and its selling price is quite competitive, only around 13 million VND. This is a very worthwhile phone to buy this year. You can visit our Mytour website to find out about the places selling and compare the prices of S21 phones from stores nationwide.