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View Poll Results: Does leaving lithium battery on charger at 100% all the time, damage the battery?
Yup. 4 36.36%
Naw. 1 9.09%
IDK (I don't know) 6 54.55%
Voters: 11. You may not vote on this poll

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Old 08-27-2022, 02:33 AM   #1
!!!
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Did I kill my cell phone battery by leaving it on the charger *ALL* the time?


This is almost like a religion or politics poll. Web researching this finds opinions from absolutely yes to absolutely no. Notably Samsung says do not leave it on the charger overnight.

I'm assuming this might apply to laptop computers also.

I tend to leave things on the charger all the time. I did this to my UMX U693CL, and it's battery is nearing end of life after about a year. My past cell phone batteries lasted a lot longer. I'm wondering if I damaged/ killed this battery by always keeping it on the charger(?)

I think Tesla recommends 80% Max because 100% always will shorten the life by a few percent (under like 10%), but never letting it go below 10 or 20%.

Last edited by !!!; 08-27-2022 at 02:47 AM.
 
Old 08-27-2022, 04:20 AM   #2
fatmac
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Leaving (modern) electrical equipment permanently connected does reduce the life of the battery - I found this out with one of my laptops.

If it is a 'quick charge' system, then yes, I'm sure it will kill it sooner rather than later.
 
Old 08-27-2022, 04:42 AM   #3
hazel
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I was always told not to recharge anything overnight because it's a fire risk. And chargers are now being shown up as classic "vampire devices", using a surprising amount of electricity when left plugged into a live socket, whether they are actually charging anything or not.
 
Old 08-27-2022, 04:50 AM   #4
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As I understand, high temperatures and high state-of-charge accelerate parasitic chemical reactions.

Phones have recently gone to very high charging rates (from 4 hours at 2.5W in my 2016 phone to 1 hour at 10W in my 2019 phone). That can't be good for the battery.
Ed
 
Old 08-27-2022, 07:57 AM   #5
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Nonetheless, I fully expect that there is a voltage regulator in the circuit which will shut off the charging voltage when the battery is fully charged. I leave my chargeable devices plugged in all the time.
 
Old 08-27-2022, 08:00 AM   #6
Ser Olmy
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There's nothing "religious" about Li-ion/Li-polymer chemistry.

Charging a lithium-ion-based battery moves Li-ions into a graphite structure. This causes mechanical stress, and over time the graphite anode will degrade. Repeated deep discharges and/or overcharging increases the wear on the anode.

Keeping the battery "fully charged", the definition of which is based on a certain (over)voltage level, also seems to increase the likelihood that dendrites form, which will eventually cause temporary or permanent shorts between the anode and cathode. The jury is still out with regards to exactly why these dendrites form, but there's more than enough statistical data to suggest that a high cell voltage contributes greatly to the effect.

Ideally, a Li-ion battery should never be either fully charged or discharged, and topping it up regularly is clearly the best strategy for enhancing battery life. This is somewhat similar to how one should treat lead-acid cells, but more or less the exact opposite strategy from what was recommended for the older NiCd technology.
 
Old 08-27-2022, 08:23 AM   #7
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Doesn't this assume a "dumb" charging system?

Are modern devices not smart enough to stop charging when almost full?

And some wont turn on until battery is charged above a certain minimum level?

 
Old 08-27-2022, 11:12 AM   #8
EdGr
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All lithium-ion batteries use smart chargers. Unfortunately, they have been designed for long run-time and short charging time, while low wear-out is not a selling point.

One thing the user can do to minimize wear-out is to shut off the phone when not in use (this is practical if one makes only outgoing calls). I charge my phone maybe once every other month.
Ed
 
Old 08-27-2022, 11:14 AM   #9
rtmistler
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Quote:
Originally Posted by boughtonp View Post
Doesn't this assume a "dumb" charging system?

Are modern devices not smart enough to stop charging when almost full?

And some wont turn on until battery is charged above a certain minimum level?

Quite so and myself working in consumer electronics I know more about battery charging regions than I care to admit, and I'm not even a person who has worked on that particular firmware.

Charging regions are areas per the hardware data sheet discussing charging characteristics, and conditions as well as safety concerns.

There are always exceptions, products can slip through safety certifications, a large company with an expensive product can still do a poor job, or have a defect in their design or code. A very small, quick, and cheap design could be done very well, or be very marginal.

Unfortunately it's both a matter of history of the manufacturer as well as circumstances on any given development.

Still there are safety certifications intended to govern the product's charging rates and temperatures all affecting battery life.
 
Old 08-27-2022, 12:45 PM   #10
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I used my old phone as my bedside alarm clock for a few years, using the Huge Clock app. The battery swelled and cracked the case after 2 years like this, but it was already a few years old before it this.

I have since upgraded phones again and using the same app on the new old phone which is about 3 years old now and been acting as a clock for 6 months now, but this time with a hardware charge limiter from Chargie, https://chargie.org/
The Chargie app is set to limit the phone charge to %50 and then allow it to discharge to %45. It does this by talking to the Chargie USB charger which will turn the power on or off as needed to the phone.

The app has setting to limit the charge to a set level and then goto full charge at a set time, so you can plugin over night and not have sit at %100 all night, but it will be at full when you wake up.
 
Old 09-01-2022, 09:43 AM   #11
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my phone is almost all days connected to charger, works just fine (its 2 years old)
 
Old 09-01-2022, 10:31 AM   #12
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FYI: A "misbehaving" lithium-ion battery can be dangerous and must be disposed of immediately. Elemental lithium burns spontaneously – and extremely hot – when exposed to oxygen, and the flames cannot be put out with water. You can find plenty of videos where someone poked a very tiny hole in a battery and was astonished by what happened next. You can create a formidable incendiary explosive with a bucket of batteries.
 
Old 09-01-2022, 10:36 AM   #13
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Quote:
Originally Posted by hazel View Post
I was always told not to recharge anything overnight because it's a fire risk. And chargers are now being shown up as classic "vampire devices", using a surprising amount of electricity when left plugged into a live socket, whether they are actually charging anything or not.
Not necessarily.
The charger for my phone is plugged into a APS (uninterruptible power supply). The LCD display shows absolutely no power draw, zero, when the phone is not plugged into the charger and 5 watts when in use. The charger also turns itself off, once the battery level reaches 100% (charged).
 
Old 09-01-2022, 12:05 PM   #14
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Quote:
Originally Posted by sundialsvcs View Post
FYI: A "misbehaving" lithium-ion battery can be dangerous and must be disposed of immediately.
thats true, there were one passenger plane incident where one plane were destroyed when lithium ion batteries started to burn and made some explosions and that resulted the captain losing control of the plane.
 
Old 09-01-2022, 03:31 PM   #15
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100% is bad.
 
  


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