J
John Doe
Guest
The 4.36 V is higher than the standard 4.20 V lithium-ion batteries
are typically charged to, therefore "overcharged" is appropriate
terminology, especially when the explanation "to provide maximum run
time between charges" is given. Being overcharged is problematic
when the battery is forever held at that high 4.36 voltage level.
--
Rick C <gnuarm.deletethisbit gmail.com> wrote:
are typically charged to, therefore "overcharged" is appropriate
terminology, especially when the explanation "to provide maximum run
time between charges" is given. Being overcharged is problematic
when the battery is forever held at that high 4.36 voltage level.
--
Rick C <gnuarm.deletethisbit gmail.com> wrote:
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Newsgroups: sci.electronics.design
Date: Wed, 22 Jan 2020 10:29:11 -0800 (PST)
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Subject: Re: OT: Smartphone always charging destroyed battery?
From: Rick C <gnuarm.deletethisbit gmail.com
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On Wednesday, January 22, 2020 at 12:55:22 PM UTC-5, John Doe wrote:
Rick C <gnuarm.deletethisbit gmail.com> wrote:
Martin Brown wrote:
Sylvia Else wrote:
John Doe wrote:
https://www.flickr.com/photos/27532210 N04/
Another Chinese battery bit the dust here. Noticed my
smartphone was bulging, the screen was warping. The cause was
obvious so, not having a torx t1 screwdriver, I ripped it
apart. Tried using a capacitor in place of the stock battery
but that didn't work. An 18650 works, but it's charged to 4.36
V.
The smartphone is used for Wi-Fi security camera monitoring,
so it is plugged in all the time.
Question: Would putting a resistor or diode in series with the
battery reduce the constant charge voltage? Is there some way
to very simply reduce the battery voltage peak while it is
always connected to the charging cable?
A simple on/off timer might be the simplest fix to avoid
continuous overcharging.
I won't attempt messing with the smartphone's charging circuit
wherever or whatever it is.
The charging circuit should completely turn off charging when
the battery is fully charged, so having it plugged into a
charger all the time shouldn't matter.
In an ideal world that might be true, but experience tells me
that most mobile devices do rebel and wreck their batteries if
left on charge continuously. I used to kill all my portable PC
batteries that way (they run faster when on mains power).
Do you really think it would have lasted longer if you had run it
down every day or even twice a day and charged back up? I keep
mine on the power cord constantly and they seem to do fine.
One positive experience is practically meaningless.
Not meaningless, representative sampling of a larger data set because if cell phones wore out their batteries prematurely just because they were charged overnight, every night, we would have all heard about it. Denial is not just a river in Egypt.
What might work simply is to put the charger on a weekly or daily
timer so that the battery does get exercised over the 20%-80%
range of charge a couple of times a week. That would probably
extend battery life.
That should all be built into the phone really. My car manages
the battery pretty well. The battery should last at least as long
as my previous vehicles did.
The damages done by the persistent high-voltage level. They are
overcharged in order to maximize run time between charges. Generally
speaking... A switch that allows keeping the battery at a lower
charge level for when it's not intended to be portable would be best.
Not overcharged, they are fully charged. If your phone is overcharging the battery it is defective.
--
Rick C.
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