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random_bot_01 t1_iwzt7nw wrote

Reply to comment by manu144x in Redmi's latest phone can be fully charged in nine minutes | Engadget by [deleted]

Why do people keep saying that, even though there are alot of fast charging phones in the market for years and no news about abt any issues

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manu144x t1_iwztby6 wrote

Because it’s physics. There’s always a trade off.

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freecodeio t1_iwzup5l wrote

> There’s always a trade off.

That's technically correct but ultimately wrong. There are things still not yet discovered that solve a problem without having a (bad) trade off.

We went from medieval healers using mint on wounds to brain surgery. Where is the trade off for that?

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manu144x t1_iwzv62l wrote

We need 10 years of study and another 20 of experience to have 1 guy capable of doing the brain surgery. You need a lot equipment and rules and liability, infrastructure and all that to do it. It’s extremely expensive.

But mints are everywhere and anybody can do it. :) Effective? probably not.

But, to keep in line with the phone example, you can have a battery load in 10 minutes, and still have reasonable cycles, fine, but it’s going to cost or going to be bigger, unless we find a new material that changes the paradigm.

As this is using just same old lithium.

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Exotic_Treacle7438 t1_ix29bx9 wrote

You’re right. Like some of the faster charging devices have a high power adapter like 60-90w+ and multiple cell batteries. So each cell charges normally but at the same rate. So you get super fast charging that appears unhealthy but is perfectly normal.

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WexfordHo t1_ix00w2g wrote

Well you see, friend, before modern medicine brain surgery was essentially a death sentence. Now it’s true there are some records of trepanation, but that’s not quite what any of us would think of as brain surgery today, and presumably most of those “patients” died. As far as repairing bleeds or removing skull fragments, dealing with cancers etc… you might as well have just beaten your patient to death as cut into their brain.

So the tradeoff was that new technology made a new paradigm possible, across the board!

There is no new paradigm to support ultra-fast charging of the type advertised here, without known tradeoffs.

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li_shi t1_ix0dlob wrote

And evaluating the trade-off without number is pointless.

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tomtom5858 t1_iwzu9ta wrote

It's literally just electrochemistry. The higher a wattage you shove into a battery, the more it degrades. The problem isn't linear, either (I believe it's geometric).

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aquarain t1_ix0ndql wrote

There are a number of processes involved. Innovation in different materials and methods should be expected. We aren't seeing zinc whiskers as often with advanced metallurgy.

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