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? I won't attempt messing with the smartphone's charging circuit wherever or whatever it is. Thanks.
OT: Smartphone always charging destroyed battery?
Started by ●January 22, 2020
Reply by ●January 22, 20202020-01-22
On 22/01/2020 4:48 pm, 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? > > I won't attempt messing with the smartphone's charging circuit wherever > or whatever it is. > > Thanks. >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. The battery says its output is 3.8V. If you don't need the ability to run during a blackout, perhaps you can find an adjustable power supply you can use instead, set to that voltage, leaving the battery out entirely. Of perhaps use somthing like this without the battery <https://www.banggood.com/XL4015-5A-DC-DC-Step-Down-Adjustable-Power-Supply-Module-p-945599.html?rmmds=detail-left-hotproducts__3&cur_warehouse=CN> again, set to give 3.8V, and run off a cheap 12V wallwart (plugpack). Sylvia.
Reply by ●January 22, 20202020-01-22
In article <h8qmt8FgpucU1@mid.individual.net>, sylvia@email.invalid says...> > 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. > > Sylvia.Quite. The instructions for my MotoG3 even say as much. Didn't stop the battery bulging to twice its proper thickness, popping the screen out of the case. And bending the motherboard so that even with a new battery it does not fit together reliably... Mike.
Reply by ●January 22, 20202020-01-22
On 1/22/2020 6:27 AM, Mike Coon wrote:> In article <h8qmt8FgpucU1@mid.individual.net>, sylvia@email.invalid > says... >> >> 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. >> >> Sylvia. > > Quite. The instructions for my MotoG3 even say as much. Didn't stop the > battery bulging to twice its proper thickness, popping the screen out of > the case. And bending the motherboard so that even with a new battery it > does not fit together reliably... > > Mike. >I had a Samsung Tablet that got very little use, it just sat on the charger. Went to get it one day and the battery had expanded and popped the case open. Mikek
Reply by ●January 22, 20202020-01-22
amdx <nojunk@knology.net> wrote:> Mike Coon wrote: >> sylvia@email.invalid says...>>> 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.>> Quite. The instructions for my MotoG3 even say as much. Didn't >> stop the battery bulging to twice its proper thickness, popping >> the screen out of the case. And bending the motherboard so that >> even with a new battery it does not fit together reliably...> I had a Samsung Tablet that got very little use, it just sat on > the charger. Went to get it one day and the battery had expanded > and popped the case open.Apparently some chargers charge to a lower than usual voltage when the device is meant to be kept on the charger between occasional uses. I'm pretty sure 4.36 V is not an ideal storage voltage for ordinary lithium ion. Maybe using a high-capacity lithium-ion battery will work, depending on the cost. I will look. There are probably cheap Chinese replacement batteries on eBay... Serialing two lithium-ion's won't work because that will decrease the charge voltage to barely over 2 V. That and maybe the internal resistance x2 will cause a problem. And then there is balancing. The device already has a power supply input that comes from USB. Problem is, that circuit expects a battery to be there. Who knows exactly what it is or how to defeat it. Putting a capacitor on it did not work.
Reply by ●January 22, 20202020-01-22
On 22/01/2020 10:36, Sylvia Else wrote:> On 22/01/2020 4:48 pm, 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. >> >> Thanks. >> > > 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).> The battery says its output is 3.8V. If you don't need the ability to > run during a blackout, perhaps you can find an adjustable power supply > you can use instead, set to that voltage, leaving the battery out entirely. > > Of perhaps use somthing like this without the battery > > <https://www.banggood.com/XL4015-5A-DC-DC-Step-Down-Adjustable-Power-Supply-Module-p-945599.html?rmmds=detail-left-hotproducts__3&cur_warehouse=CN> > > > again, set to give 3.8V, and run off a cheap 12V wallwart (plugpack).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. -- Regards, Martin Brown
Reply by ●January 22, 20202020-01-22
On Wednesday, January 22, 2020 at 5:36:29 AM UTC-5, Sylvia Else wrote:> On 22/01/2020 4:48 pm, 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? > > > > I won't attempt messing with the smartphone's charging circuit wherever > > or whatever it is. > > > > Thanks. > > > > 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.I think what you're saying is that with 8 core cpus running at 1ghz+ and correctly charging a battery being very important, it's reasonable to assume that cell phones have smart, correct charging and battery monitoring. If it's just used for wifi monitoring, maybe buying a used phone on Ebay for $20 is a batter idea. Could probably even buy a locked or black listed one, it doesn't have to work on the cell network.> > The battery says its output is 3.8V. If you don't need the ability to > run during a blackout, perhaps you can find an adjustable power supply > you can use instead, set to that voltage, leaving the battery out entirely. > > Of perhaps use somthing like this without the battery > > <https://www.banggood.com/XL4015-5A-DC-DC-Step-Down-Adjustable-Power-Supply-Module-p-945599.html?rmmds=detail-left-hotproducts__3&cur_warehouse=CN> > > again, set to give 3.8V, and run off a cheap 12V wallwart (plugpack). > > Sylvia.
Reply by ●January 22, 20202020-01-22
Smartphone charging maximizes uptime when not connected, by keeping the battery at the highest temporarily safe voltage level. That's why the battery voltage is 4.36. That's why there is no UL marking on the battery. This poster should've read the replies before spewing nonsense... -- Whoey Louie <trader4 optonline.net> wrote:> X-Received: by 2002:a05:6214:a08:: with SMTP id dw8mr11111915qvb.121.1579707620573; Wed, 22 Jan 2020 07:40:20 -0800 (PST) > X-Received: by 2002:a05:620a:22d1:: with SMTP id o17mr920803qki.137.1579707620296; Wed, 22 Jan 2020 07:40:20 -0800 (PST) > Path: eternal-september.org!reader01.eternal-september.org!feeder.eternal-september.org!news.gegeweb.eu!gegeweb.org!usenet-fr.net!proxad.net!feeder1-2.proxad.net!209.85.160.216.MISMATCH!g89no10966552qtd.0!news-out.google.com!o19ni600qtr.1!nntp.google.com!g89no10966544qtd.0!postnews.google.com!google-groups.googlegroups.com!not-for-mail > Newsgroups: sci.electronics.design > Date: Wed, 22 Jan 2020 07:40:19 -0800 (PST) > In-Reply-To: <h8qmt8FgpucU1 mid.individual.net> > Complaints-To: groups-abuse google.com > Injection-Info: google-groups.googlegroups.com; posting-host=172.58.235.207; posting-account=C1SVQAkAAACfJY63oQnKBve0H-yhg4CH > NNTP-Posting-Host: 172.58.235.207 > References: <r08nnm$vip$2 dont-email.me> <h8qmt8FgpucU1 mid.individual.net> > User-Agent: G2/1.0 > MIME-Version: 1.0 > Message-ID: <7d6ddd03-88ca-46cd-bb2f-4e53a93dddbe googlegroups.com> > Subject: Re: OT: Smartphone always charging destroyed battery? > From: Whoey Louie <trader4 optonline.net> > Injection-Date: Wed, 22 Jan 2020 15:40:20 +0000 > Content-Type: text/plain; charset="UTF-8" > Xref: reader01.eternal-september.org sci.electronics.design:580336 > > On Wednesday, January 22, 2020 at 5:36:29 AM UTC-5, Sylvia Else wrote: >> On 22/01/2020 4:48 pm, 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? >> > >> > I won't attempt messing with the smartphone's charging circuit wherever >> > or whatever it is. >> > >> > Thanks. >> > >> >> 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. > > I think what you're saying is that with 8 core cpus running at 1ghz+ > and correctly charging a battery being very important, it's reasonable > to assume that cell phones have smart, correct charging and battery > monitoring. > > If it's just used for wifi monitoring, maybe buying a used phone on > Ebay for $20 is a batter idea. Could probably even buy a locked or > black listed one, it doesn't have to work on the cell network. > > > > > > > >> >> The battery says its output is 3.8V. If you don't need the ability to >> run during a blackout, perhaps you can find an adjustable power supply >> you can use instead, set to that voltage, leaving the battery out entirely. >> >> Of perhaps use somthing like this without the battery >> >> <https://www.banggood.com/XL4015-5A-DC-DC-Step-Down-Adjustable-Power-Supply-Module-p-945599.html?rmmds=detail-left-hotproducts__3&cur_warehouse=CN> >> >> again, set to give 3.8V, and run off a cheap 12V wallwart (plugpack). >> >> Sylvia. > > >
Reply by ●January 22, 20202020-01-22
On Wednesday, January 22, 2020 at 9:10:52 AM UTC-5, Martin Brown wrote:> On 22/01/2020 10:36, Sylvia Else wrote: > > On 22/01/2020 4:48 pm, 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. > >> > >> Thanks. > >> > > > > 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 computer I had did warn you that constantly using the power cord would shorten the life of the battery, but rather than provide a mode where I don't have to charge the battery to 100% while using the power cord, they just let you click the button and resume working. Stupid Lenovo.> > The battery says its output is 3.8V. If you don't need the ability to > > run during a blackout, perhaps you can find an adjustable power supply > > you can use instead, set to that voltage, leaving the battery out entirely. > > > > Of perhaps use somthing like this without the battery > > > > <https://www.banggood.com/XL4015-5A-DC-DC-Step-Down-Adjustable-Power-Supply-Module-p-945599.html?rmmds=detail-left-hotproducts__3&cur_warehouse=CN> > > > > > > again, set to give 3.8V, and run off a cheap 12V wallwart (plugpack). > > 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. -- Rick C. - Get 1,000 miles of free Supercharging - Tesla referral code - https://ts.la/richard11209
Reply by ●January 22, 20202020-01-22
onsdag den 22. januar 2020 kl. 18.32.01 UTC+1 skrev Rick C:> On Wednesday, January 22, 2020 at 9:10:52 AM UTC-5, Martin Brown wrote: > > On 22/01/2020 10:36, Sylvia Else wrote: > > > On 22/01/2020 4:48 pm, 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. > > >> > > >> Thanks. > > >> > > > > > > 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 computer I had did warn you that constantly using the power cord would shorten the life of the battery, but rather than provide a mode where I don't have to charge the battery to 100% while using the power cord, they just let you click the button and resume working. Stupid Lenovo. >https://forums.lenovo.com/t5/Welcome-FAQs-Knowledge-Base/How-can-I-increase-battery-life-ThinkPad/ta-p/244800
