I'm visiting my brother and there is no room to keep my laptop open, so
I've been using one of his family chargers lying around the apartment.

It seems to charge 4 times as fast as whe I charge from the USB port on
my laptop.

Is that true? Does this mean these things are fast chargers and not
just chargers?

Are their disadvangages from charging so fast? Like do I get spongy
lead? That's when the lead sulfate gets mixed with Pb02 during
recharging, so it says it can become maximally charged, but it still
doesn't have as much capacity as if it were fully charged but more
slowly.

If not lead, does it get spongy lithium?

There is also usb port on the 110v 5-outlet strip that people use now as
an extension cord. My brother is sleeping so I can't see what's written
next to the port, 2.4 amp maybe. Will that be even faster? Is there a disadvantage to even faster?

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micky <[email protected]> wrote:

I'm visiting my brother and there is no room to keep my laptop open, so
I've been using one of his family chargers lying around the apartment.

It seems to charge 4 times as fast as whe I charge from the USB port on
my laptop.

Without details no-one can say for sure, but the laptop USB port could
be as little as 500mA and the USB-charger might be 2A, so indeed four
times as much/fast.

Is that true? Does this mean these things are fast chargers and not
just chargers?

Are their disadvangages from charging so fast?

The phone should limit (negotiate) the current it can handle, so it
should not be too bad. But in general, fast charging is 'worse' than
'slow' charging. My phone has a setting not to fast charge. Perhaps your
phone has such a setting as well. OTOH, a few fast charges would have no noticeable negative effect on the battery.

[...]

There is also usb port on the 110v 5-outlet strip that people use now as
an extension cord. My brother is sleeping so I can't see what's written
next to the port, 2.4 amp maybe. Will that be even faster? Is there a disadvantage to even faster?

2.4A is quite normal, and again, the phone should limit what it can
handle.

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micky, 2023-12-31 21:16:

I'm visiting my brother and there is no room to keep my laptop open, so
I've been using one of his family chargers lying around the apartment.

It seems to charge 4 times as fast as whe I charge from the USB port on
my laptop.

Is that true? Does this mean these things are fast chargers and not
just chargers?

Yes, this is true, because your laptop only provides 2.5 Watts (0.5A at
5V) or 4,5 Watts (0.9A at 5V) depending on how the smartphone negotiates
its power demand.

The charger, however, can provide up to 20V and more than 1A depending
on the standard the smartphone and charger use (for example USB PD or Quickcharge) and thus can charge with 20 Watts or more. With USB PD EPR
the voltage can be even higher - up to 48V - to deliver up to 240 Watts
at 5A.

Are their disadvangages from charging so fast? Like do I get spongy

In theory the battery may not last as long when charged with a higher
power. However smartphones with quick charging often have more than one
battery cell to be able to charge multiple cells in parallel, so the
individual cells do not suffer that much from high charging currents.
Also modern batteries are designed to cope with more charging power as well.

[...]

There is also usb port on the 110v 5-outlet strip that people use now as
an extension cord. My brother is sleeping so I can't see what's written
next to the port, 2.4 amp maybe. Will that be even faster? Is there a disadvantage to even faster?

The ampere rating does not help without knowning the supported standard.
If it is just USB without anything else, your phone will not charger
faster as on your laptop. Outlet strips often don't support USB-PD or
Quickarge and just provide a maximum output at 5V which will not help
you as modern phones need *more* than 5V for quick charging.

--
Arno Welzel
https://arnowelzel.de

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On 12/31/2023 12:16 PM, micky wrote:

<snip>

There is also usb port on the 110v 5-outlet strip that people use now as
an extension cord. My brother is sleeping so I can't see what's written
next to the port, 2.4 amp maybe. Will that be even faster? Is there a disadvantage to even faster?

Some recent vintage laptops have a USB-C PD output port that provides high-wattage charging for phones, but for most you'll be at around 5
watts (5V@1A) and some may be even lower (5V@500mA).

A USB-C PD/QC wall wart will support high-wattage charging and will
negotiate with the phone for the highest charge rate then ramp down the
wattage as the phone approaches full charge.

<https://www.amazon.com/dp/B0BNWWFDJL> is a good choice for USB-C phones
at $10 each, 40W maximum.

A USB-A wall wart will often supply 12 watts ([email protected]) for USB QC
capable phones.

You can get USB-C PD adapters that go up to 150 watts. For laptops, you
can buy a USB-C "trigger cable" to the voltage (usually 19V) and type of
power jack on the laptop.

I use this one <https://www.aliexpress.us/item/3256804785143893.html> on
my Lenovo Core i9 laptop.

--
“If you are not an expert on a subject, then your opinions about it
really do matter less than the opinions of experts. It's not
indoctrination nor elitism. It's just that you don't know as much as
they do about the subject.”—Tin Foil Awards

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