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Debating with a teacher...

post #1 of 11
Thread Starter 
Hello I am hoping you will be able to help me today.

I am in the middle of college And I have dell latitude V13 laptop.
Not a flash laptop just primarily for school work.

Another student in the class has just had there laptop run out of battery. When we first received the laptops the batteries lasted for around 4.5 hours, Now they last for around 3 hours and 30 minutes. Our teacher said that its because we have gotten lazy and just charge it all night, Which we do. but the thing is Im sure all of the latest laptops have inbuilt cut of switches.

So basically would charging a laptop all night ( On hibernate) affect the battery more than charging it till its full Then unplugging it and turning it off.

Seeing I use my desktop at home I will still continue to leave the laptop charging all night but still am very interested on what would give me more battery charge per day...

Thankyou in advance.
Daniel
Edited by Raged-Daniel - 8/22/11 at 8:36pm
post #2 of 11
Batteries naturally lose their longevity after enough charge cycles.

As to the duration of time left on the charger, I'm fairly certain they cut off the juice at a certain point, but someone correct me if I'm wrong.
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post #3 of 11
Some batteries have built in cutoff but most don't.
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post #4 of 11
It would be best to charge and turn it off. You have to use the battery to make it keep its life, but you also don't want to overuse them. Besides within a 1-2 years most laptop batteries are at the point they only last 30min. It is natural decline. You can try reconditioning to help but it will still be much less then what it already is. Although, leaving it on the charge souldn't affect it because they should stop charging when the battery is full just make sure it is not running.
    
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post #5 of 11
Overcharging a battery is very harmful to its cells. Cycling is what you should do to get the most out of your battery. A complete discharge and full charge(not overcharge) will give you the best run time. Battery cells build memory retention and if you charge them before they are out of juice or use them before they are fully charged you are shortening the life of the battery pack. I would have to agree with your teacher.
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post #6 of 11
http://en.wikipedia.org/wiki/Lithium-ion_battery

Nothing to do with charging it all night. And to the above poster memory has nothing to do with it, Li-ion batteries aren't affected by memory.
post #7 of 11
Leaving the charger attached to the laptop over night is harmful to the battery and does cause permanent damage over long term usage/batt life. Despite being fully charged the capacitive nature of batteries still induces/accepts a charge which degenerate individual cells.

The best method for increasing longevity is to render the battery completely empty/drained and charge to full capacity. Apple calls this "calibration", but is a principle that works on any nickel/lith-ion battery. Also, disabling peripherals such as WiFi, screen brightness and any OS logging services.
 
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post #8 of 11
Quote:
Originally Posted by Voltage_Drop View Post
Overcharging a battery is very harmful to its cells. Cycling is what you should do to get the most out of your battery. A complete discharge and full charge(not overcharge) will give you the best run time. Battery cells build memory retention and if you charge them before they are out of juice or use them before they are fully charged you are shortening the life of the battery pack. I would have to agree with your teacher.
This

LI-ION batteries lose life exponentially when you overcharge them over and over.
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post #9 of 11
Quote:
Originally Posted by DaClownie View Post
Batteries naturally lose their longevity after enough charge cycles.

As to the duration of time left on the charger, I'm fairly certain they cut off the juice at a certain point, but someone correct me if I'm wrong.
this
that and junk in the os slowing the systems down and wasting resources that was not there at first
Edited by 3dfxvoodoo - 8/22/11 at 8:45pm
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post #10 of 11
One of the nice things about Lenovo's ThinkPads is their Power Manager, which lets you set the charge threshold; you can set the system to stop charging when you hit 90-95% (or another arbitrary value. Also, since you don't want to drain a lithium ion battery fully (thus increasing charge cycles) except for when you're "calibrating" it, you can also set the battery not to charge until it's drained to a user-specified percentage.
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