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If they can charge a car in 5 minutes using 1.3 MW charging, why wouldn't 120 Watt be fine for charging your phone in 20? Also the charging is protecting the battery by reducing speed as it approaches 100%. The lifespan seems fine, I'm not detecting any deterioration. By today's standards it's not even that fast. And it is very convenient to be able to top it off quickly. That way I also don't have to leave it charging overnight, I can do it while I make coffee and eat my breakfast. That way I minimize trickle charging which can also harm the battery.
The battery has to be made for fast charging, and Samsung is apparently way behind on that.
Then why did you buy a Samsung?
Trickle charging does not harm batteries. On the contrary, the slower you charge a battery the safer it is. This is why all battery protection reduces charging wattage as the battery gets more and more full. Fast charging damages batteries, faster charging means faster degradation. There's no way around that, it's just physics, entropy comes for us all. Battery makers are just betting you'll buy a new device before it becomes noticeable.
I'm curious what car charges at 1.3MW. Most I've heard of is closer to a quarter of that, and that's only for 20-80% before it drops back significantly because it generates significantly more heat gain the upper 20-30%
BYD has the entire 1MW system ready in cars you can buy today, with charging stations for it being rolled out in China.
CATL has a battery capable of 1.3MW, but it is AFAIK not available in any cars yet.
Current high end Chinese cars on the market in EU are about 400 kW charging.
BYD Charges at 1MW, although they will probably not be available in America due to protectionism.
1.3 MW is the newest CATL Battery, which for American manufacturers were supposed to work with, but may be impossible now too due to protectionist tariffs.
https://insideevs.com/news/756144/byd-han-l-megawatt-charging/
https://www.perplexity.ai/discover/top/catl-unveils-battery-charging-K2CWUCOTQuuj6G_DkbaTjw
But even a pretty average 80-85kWh car today can charge 10-80% in about 20 minutes. More expensive cars do it in 15 minutes.