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Is 25W charging a deal-breaker for the Galaxy S21?

Samsung Galaxy S21 vs. Galaxy S21 Ultra
Samsung Galaxy S21 vs. Galaxy S21 Ultra (Image credit: Hayato Huseman / Android Central)

Samsung's Galaxy S21 is a phone that has a lot going for it. Whether it be the Snapdragon 888 processor, upgraded cameras, lower prices compared to last year, or anything else in between, there are plenty of reasons to be excited about this latest batch of Galaxy S flagships.

That said, there is one aspect of the S21 series that has ruffled some feathers: charging speeds. In a world where competing phones are offering 45W, 60W, and even 100W charge speeds, the Galaxy S21 being limited to just 25W does feel a bit archaic. There are plenty of options out there when it comes to the best Samsung Galaxy S21 chargers, but no matter which one you choose, you're still limited to max speeds of 25W.

A few of our forum members recently got to talking about the topic, saying:

Honestly I just think Samsung are weird and/or cheap. They've always been a few years behind on charging tech. not to mention doubling the charging power the same year you don't provide a charger for the first time seems like a recipe for bad press.


Without getting too deep into the weeds, charging Li-ion batteries can be a delicate science, and that is the limiting factor. In general, Li-ion batteries can be charged at a rate equal to their capacity without stressing the battery too much. For a 5000 mAh (5Ah) like what is in the S21 Ultra, that equates to a maximum 5A of input current. The voltage going into the battery (not the output...


If I have a phone that lasts all day I usually charge them overnight on a timed, low wattage charger. I leave the fast charging for those occasions that I need it. While I've never performed a scientific study, I believe that fast charging will reduce battery life and I've been operating in this manner for years.


I have never felt need for anything above 25W. The extra cost to save 5 minutes was no biggie to me.


This got us to wondering — Is 25W charging a deal-breaker for the Galaxy S21?

Join the conversation in the forums!

Joe Maring was a Senior Editor for Android Central between 2017 and 2021. You can reach him on Twitter at @JoeMaring1.

  • 25watt charging is just fine by me. Waiting anxiously for the S21+?
  • Samsung doesnt have a charging system like Oneplus/oppo where a lot of the heat is transferred to the charger. I suspect Samsung is concerned about heat so thats why the 45W is throttled.
  • Those crazy charge speeds just reduce your battery's life. Samsung increased it from 15w after the S10 but are sensible to leave it at 25w. OnePlus use 30w.
  • Oneplus now uses 65W charging. They accomplish this by splitting the battery in two.
  • Total charge time not much different. Biggest difference is from 0-60%??? or so. I could see a need if in a rush and just needed enough charge for a few hours but not every charge
  • 25W is fine to me I would sure like to have 25W wireless charge. I have the note 20 ultra and it's just 25W and only wire charge it maybe a couple of times a week. Most times I use wireless charging try to keep between 20 and 80 percent. I had 45W with the Note 10 plus and it seemed the battery had degraded at a faster pace with that phone than other phones and only charged at 5 to 8% faster than the 25W.
  • The inner nerd in me is screaming that I would want more than 25 W but in actuality I don't need more than that. Currently 18 W on my iPhone 11 Pro is fairly fast. I think charging speed is good enough just like Flagship performance is good enough.