this post was submitted on 14 Aug 2024

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Realme’s 320W fast charging can fully charge a smartphone in four and a half minutes (www.theverge.com)

submitted 2 months ago by [email protected] to c/[email protected]

12 comments fedilink hide all child comments

Charge your phone in less time than it takes to find your charger.

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[–] [email protected] 8 points 2 months ago (2 children)

i feel like that’s bad for your phone

[–] [email protected] 3 points 2 months ago (1 children)

That's a 13C charge rate, a normal lithium battery would get very hot and puff up, possibly even catching on fire.

To safely charge at that rate, you need a battery that is specifically designed for it. High speed charging will probably be a lot more common when phones start using solid state batteries though.

[–] [email protected] 1 points 2 months ago (1 children)

i’m hoping for super-capacitors, personally

[–] [email protected] 2 points 2 months ago (1 children)

Super capacitors are great for when high charge or discharge rates are needed. They can be charged in seconds. Unfortunately the energy density is significantly worse than batteries and they self discharge in days.

If a typical phone was super capacitor powered, it would weight 5kg and be bigger than a 1980's Motorola.

[–] [email protected] 1 points 2 months ago

well i’m hoping they get better

[+] [email protected] -7 points 2 months ago (1 children)

Not really. Current phone batteries has limited life cycles based on full charge and discharge, that's why it's recommended to not go to 0% or 100% if you want to prolong the life of the battery. The speed doesn't really impact the health, assuming the phone has a way to dissipate the heat generated.

[–] [email protected] 6 points 2 months ago (2 children)

assuming the phone has a way to dissipate the heat generated.

Yeah that’s a big assumption. My phone gets hot charging at 20w, don’t you think there will be heat dissipation issues at those speeds?

Chemistry has improved, but even a Tesla will not let you super charge all the time- I’d need to see some real data before I believe that a battery charged 100 times fast has exactly the same health as one charged 100x slow.

[–] [email protected] 1 points 2 months ago

There are many speculations that fast charging hurts the battery, but preliminary results in regard to 240W charging shows that the cooling technologies and management systems are able to handle it and doesn't impose additional wear on the battery. There are no comprehensive independent studies on this as far as I know, and Chinese companies are improving the tech all the time, as evidenced by 300W tech recently and now 320W.

And the phones don't charge at full speed all the time, management systems regulate it and the last few % are always delivered at low W.

[–] [email protected] 1 points 2 months ago

OnePlus mitigates a bunch with tech separating the battery into multiple batteries. I'm charging at 100w rn, but it's 2 cells, each charging at 50w. It barely gets warm. -no fap.

[–] [email protected] 6 points 2 months ago

And you can even fry an egg on the battery at the same time!

[–] [email protected] 4 points 2 months ago

Just make a phone with user replaceable, commodity batteries. Then if the battery wears out after 1 year of daily charging, $5 gets you a new one.

[–] [email protected] 1 points 2 months ago

What am I going to do with a fully-charged fireball?