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Do you leave your battery inside your laptop when you are using AC power?


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Do you leave your battery inside your laptop when you are using AC power?

Will you lose battery life if you leave the battery in your laptop after it is fully charged? Should we remove it after it has been fully charged?

 

Note: Macbooks' batteries are built in...

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My PowerBook's battery is ever attached, I use the PB connected to AC most of the time, when I used with battery only for a few minutes or I don't use it at all it is connected all the time.

 

Battery is 4 years old and gives me 2 hours of life, and several days of sleep.

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The thing that kills batteries is usually not recharging, no matter how often or long or whatever, but heat. As we all know macs love to get extra warm at times, thus heating the battery up and reducing battery-life. So if you know you`re not going to need the battery for some time, it could be adviseable to place it somewhere not so hot.

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The thing that kills batteries is usually not recharging, no matter how often or long or whatever, but heat. As we all know macs love to get extra warm at times, thus heating the battery up and reducing battery-life. So if you know you`re not going to need the battery for some time, it could be adviseable to place it somewhere not so hot.

It's not heat, battery chemicals will heat up, but they will cool back down to the state they were in before. It's the fact that batteries continue to charge when it's at 100%. The Macbook/Macbook Pros don't charge, even if plugged into AC power, if the charge is above 95%. When it gets below, it charges back up to 100% and lets it go back down to under 95% again. A half year going on my laptop, constantly plugged in with battery, still at 98% health, with 5 hours of battery life with wi-fi and middle brightness.

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couple of comments,...

 

the older laptops, did not have such refined charging circuit,...

as such, they charged all the time a litle, the newer laptops, 2007+,

stop charging at 95 or 98%, some even have recondition circuits ,...

some laptops, like dell will charge faster , then say thinkpads,

as such the battery life will be shorter,...

... not charging,... with li-ion is fine, since they don't deplete like ni-mh ,

also li-ion cells, have protection circuit, and laptop batteries, also have charge and health state circuit buildin,

that's why they are more costly,...

running the batteries down to 5% ocationally is, actually good,

leaving them in an old laptop day by day is not,

as for mechanical attributes, sure, it feels and looks strange, but there is nothing wrong, without it,

most batteries are pritty sloppy, as such, don't provide major strength.

like with bicyles and chains, best life, is with 2 or more, and regular maintence ,

but most of us don't have 2 or more batteries, to alternate, and an RC- li-ion pack charger, reconditioner,

 

other conditions,... leaving laptop in the car,... in summer,....or freezing winter, will shorten the life

and bigger packs, last longer, since they discharge slower, on the other end, some large packs don't ,

since the cells need to be matched, and if one cell goes bad, it drags down the whole pack,...

 

the big thing, is , that on an hack, the battery last shorter, since the powermanagment, don't quiet work right,

no speedstep, or no screen dimming, throttle,....no powermizer for nvidia cards, quicktime codec, don't use the graphics stream processor,...

power managment striped, due efi workaround, etc,... the desktops are ok, graphics soso, notebooks, not there yet,....

think apple is coming out with some new macbooks,....

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If you plan on using AC power for an extended time, say a week or more, it's best to discharge your battery to 40%, remove it, and store it in a cool dry place.

 

Lithium ion batteries don't like to stay fully charged or fully discharged, and they don't like heat. They especially don't like a combination of both, which is what you get when you keep a warm laptop plugged in. Lithium ion batteries last longest if they're frequently charged and discharged. They also dislike deep cycling, ie: charging to 100% then discharging to 0% all the time, unlike nickel-cadmium batteries they don't have a "memory" effect. It is good though, to do this once in a while since it resets the charging and limiting circuit in the battery.

 

For a needlessly long explanation of this, check out http://batteryuniversity.com/partone-5A.htm

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