Leaving charger on

**Chillidog66** · 09-03-2012, 08:11 AM

Does it hurt the battery to leave the phone on the charger after its fully charged?

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**funkylogik** · 09-03-2012, 08:20 AM

i do it but it causes a lot of heat and bad for the environment. best thing to do is buy one of those timers that plug into the wall socket

**Soundtrack to Chaos** · 09-03-2012, 10:58 AM

It also runs down your battery more than if you charge, take out the plug and shut down your phone

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**walcolm** · 09-03-2012, 11:19 AM

The battery is supposed to cut off current once it hits 100% so it should not heat up due to overcharging unless you have a defective unit

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**jaj6503** · 09-03-2012, 11:59 AM

Nah man

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**not2gutta** · 09-03-2012, 12:05 PM

I wonder the same...I like to keep it plugged in while using Pandora/hotspot so when I go out I still have battery life. I find it odd thatthe red charging light status remains red after hitting 100% then after time a notification comes up and says it's charged and to unplug it...hmmph

Also, if I leave my charger plugged in all day am I consuming unnecessary energy?

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**deanodrums** · 09-04-2012, 01:54 AM

I also wondered if this was a bad thing. I was forever charging my BB just incase i had run out. My S3 is brilliant i can go a day and a half without charging it. I dont do gamming and just a very moedrate user.

**davidnc** · 09-04-2012, 05:29 AM

As mentioned once the battery reaches 100% it stops charging the battery.So it wont hurt the battery.
When I have to charge my phone(s) tho I try do it while I am awake.Once the green light comes on I know I am good to go for another 30 hrs or so .

**jcp007** · 09-04-2012, 06:10 AM

No worries. I leave mine on a charger at work while not in use, in the car to and from the office, and at home while not in use.

Sent From My Galaxy Note 10.1 Tablet

**jneusch** · 09-04-2012, 07:59 AM

I charge overnight and when I wake up the phone shows 100%. As soon as I use it for a few minutes it drops quickly 97-98%/. I put it back on the charger until the green light comes on again and the battery has a much better charge. This indicates what others are saying is true: charging stops once the phone hits 100%. When I put mine back on in the morning it usually takes 20 - 30 minutes to hit 100% again.

**funkylogik** · 09-05-2012, 09:42 AM

Originally Posted by jneusch

I charge overnight and when I wake up the phone shows 100%. As soon as I use it for a few minutes it drops quickly 97-98%/. I put it back on the charger until the green light comes on again and the battery has a much better charge. This indicates what others are saying is true: charging stops once the phone hits 100%. When I put mine back on in the morning it usually takes 20 - 30 minutes to hit 100% again.

search playstore for battery calibration or battery calibrator and find one that doesnt require root access (unless youre rooted)
the calibration on my s3 was 8% out according to the app and since using it (follow the instructions) my battery seems to last longer and after taking it off charge it starts at 100% then goes down normaly 1% at a time

**funkylogik** · 09-05-2012, 09:47 AM

Originally Posted by not2gutta

I wonder the same...I like to keep it plugged in while using Pandora/hotspot so when I go out I still have battery life. I find it odd thatthe red charging light status remains red after hitting 100% then after time a notification comes up and says it's charged and to unplug it...hmmph

Also, if I leave my charger plugged in all day am I consuming unnecessary energy?

Sent from my SCH-I535 using Tapatalk 2

think about it mate. touch the charger and its hot even without a phone plugged in. heat energy takes a lot of electricity. the charger is just a transformer (works in similar way to wireless chargers but within the unit) the coil is putting resistance on the electricity and releasing it as heat energy. we have around 3 chargers constantly plugged in lol. ur prob only wasting as much power as those plug-in air fresheners

**funkylogik** · 09-05-2012, 10:10 AM

Originally Posted by not2gutta

I wonder the same...I like to keep it plugged in while using Pandora/hotspot so when I go out I still have battery life. I find it odd thatthe red charging light status remains red after hitting 100% then after time a notification comes up and says it's charged and to unplug it...hmmph

Also, if I leave my charger plugged in all day am I consuming unnecessary energy?

Sent from my SCH-I535 using Tapatalk 2

think about it mate. touch the charger and its hot even without a phone plugged in. heat energy takes a lot of electricity. the charger is just a transformer (works in similar way to wireless chargers but within the unit) the coil is putting resistance on the electricity and releasing it as heat energy. we have around 3 chargers constantly plugged in lol. ur prob only wasting as much power as those plug-in air fresheners

**TankMech** · 09-05-2012, 10:20 AM

The battery stops charging after 100% like already stated. I if it's on the charger still, but it will be on an ac current. The phone will run still if you take the battery out. In other words it will only be charging when the battery is low, and and running only off the wall ac current when not.

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**534n** · 09-05-2012, 11:17 AM

If you leave the charger in and you have a correctly functioning charge controller, the battery will be cut off once it reaches 100% and the charge current will be limited to enough to keep the phone running. The charger will be cold if your phone is idle, but if you are doing something demanding with the phone plugged in then it may warm up to supply constant power the the hardware, as the charger is just taking the place of the battery after 100%. Also, from a transformer's perspective, you are not using any more electricity by leaving it plugged in (with or without the phone attached) other than small coil eddy currents, since an unloaded transformer is essentially an open circuit. All the crap about "ghost currents" when you leave devices plugged into the wall is nonsense. Sure, if you have 30-50 of them plugged in, then there may be a measurable draw, but with a regular household, I would say no. And yes, new phones can be run on AC without the battery in, while old phones had a different circuit setup and would say "Insert battery" if you tried to boot it on AC only.

If the charger is even warm to the touch without a load attached, then something is wrong with it.

**EvilMonkey** · 09-05-2012, 08:01 PM

This seems like the 40th time I've posted this (this month), but here goes again.

In short, no it won't hurt and yes the phone quits drawing current after it's charged (with periodic recharges as the battery drains)

**jneusch** · 09-05-2012, 08:56 PM

Originally Posted by funkylogik

search playstore for battery calibration or battery calibrator and find one that doesnt require root access (unless youre rooted)
the calibration on my s3 was 8% out according to the app and since using it (follow the instructions) my battery seems to last longer and after taking it off charge it starts at 100% then goes down normaly 1% at a time

Yeah, I downloaded that app and mine was off 3%. Mine still holds charge a little longer when I bump charge it back to 100%. I did it with my iPhone before this one and it worked the same way.

**funkylogik** · 09-07-2012, 07:53 AM

Originally Posted by jneusch

Yeah, I downloaded that app and mine was off 3%. Mine still holds charge a little longer when I bump charge it back to 100%. I did it with my iPhone before this one and it worked the same way.

i keep tryin to preach calibration to people mate. usualy its only needed when u install a new rom but the s3 seems to come badly calibrated. also if u change to a new battery

**GalaxyOnyxWitch** · 09-07-2012, 09:36 AM

This is one of the best reads on battery and charging that I have read in a while courtesy of our friends over at Xda:

**wecaz** · 11-17-2012, 08:08 AM

Well, thanks for sharing your views. Here is something contrary that I observed with my android:

1) After battery is 100% charged and AC charger is connected, I took out the battery and phone is dead (AC is ON).

2) Without inserting the battery, I tried to switch ON with AC charger connected, then the phone vibrates, shows the model number on screen (as always) and dead again.

Now I should assume that my phone does not work without battery.

Model: Samsung Galaxy S Duos (GT-S7562)
Android: 4.0.4 ICS

Thanks,
wecaz

Originally Posted by EvilMonkey

This seems like the 40th time I've posted this (this month), but here goes again.

In short, no it won't hurt and yes the phone quits drawing current after it's charged (with periodic recharges as the battery drains)

**worwig** · 11-17-2012, 09:12 AM

Originally Posted by wecaz

Well, thanks for sharing your views. Here is something contrary that I observed with my android:

1) After battery is 100% charged and AC charger is connected, I took out the battery and phone is dead (AC is ON).

2) Without inserting the battery, I tried to switch ON with AC charger connected, then the phone vibrates, shows the model number on screen (as always) and dead again.

Now I should assume that my phone does not work without battery.

No it does NOT run without a battery.

People are pretty clueless with the charger comments. The phone is smart, plug it into the charger, and leave it plugged in whenever possible. Then you will have a charged battery when you need it. The phone is smart enough to manage the battery safely. In fact, the battery itself even has additional safeties to prevent over charging and under discharging.

Again, the phone is smart. It charges the battery at the proper rate, then tapers the charge and shuts off the charger as needed. It amazes what people think about this phone that is designed with GPS radios, Glonass radios, G sensors, light sensors, two cameras, a huge display, two microphones, two speakers, processors, ram, roms, memory card, LTE radios, WiFi, Bluetooth, USB, headphone jack, and a lot more that I've missed no doubt. Yet the designers were so stupid that they left out a smart charging circuit! I don't think so. Plug it into a 5 volt charger whenever you can and remain calm.

**gollum18** · 11-17-2012, 11:40 PM

Actually no mobile phone will truly charge to 100%, the software shuts down the current once it reaches 95-98% depending on the phone to prevent overcharging. The software just tells the phone to report 100% the same with any other rechargeable mobile device.

But yes contrary to popular belief it will not hurt your phone to leave it plugged in to the charger at full. I usually only do though when I go to sleep at night since that's usually the only time I charge mine.

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**odyss** · 02-12-2013, 06:10 AM

You can use this app.You will not worry about your battery while using this app

Battery Full Alarm :

**meyerweb** · 02-12-2013, 10:01 AM

Originally Posted by GalaxyOnyxWitch

This is one of the best reads on battery and charging that I have read in a while courtesy of our friends over at Xda:

The best advice from that article:

stop paying such close attention to your battery gauge and to just use your phone. Charge it whenever you can, and then stop obsessing over the exact numbers. If you really need more usage time, buy an extended-capacity battery and use it normally.

**meyerweb** · 02-12-2013, 10:04 AM

Originally Posted by EvilMonkey

This seems like the 40th time I've posted this (this month), but here goes again.
In short, no it won't hurt and yes the phone quits drawing current after it's charged (with periodic recharges as the battery drains)

Originally Posted by wecaz

Well, thanks for sharing your views. Here is something contrary that I observed with my android:

1) After battery is 100% charged and AC charger is connected, I took out the battery and phone is dead (AC is ON).

2) Without inserting the battery, I tried to switch ON with AC charger connected, then the phone vibrates, shows the model number on screen (as always) and dead again.

Nothing in your experiment contradicts that article.