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Query about charging notebook battery

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Anonymous
September 10, 2005 4:15:56 AM

Archived from groups: alt.sys.pc-clone.dell (More info?)

My new notebook came with the 8-cell Lithium Ion Battery.

Suppose I use it and it has say 35% power left.

Can I recharge the battery at that time?

Well, I know I can, but do these batteries have "memories" in the sense that
you get better battery life by waiting for it to discharge almost completely
or completely before recharging it??

Mel
Anonymous
September 10, 2005 8:29:10 AM

Archived from groups: alt.sys.pc-clone.dell (More info?)

"MB_" <mel@prodigy.invalid.net> wrote in message
news:46tUe.33849$1g2.5062@fe05.lga...
> My new notebook came with the 8-cell Lithium Ion Battery.
>
> Suppose I use it and it has say 35% power left.
>
> Can I recharge the battery at that time?
>
> Well, I know I can, but do these batteries have "memories" in the sense
> that you get better battery life by waiting for it to discharge almost
> completely or completely before recharging it??
>
> Mel
>

no memory, charge at any time.

this said I do drop mine to 10% every week.
Anonymous
September 10, 2005 10:09:59 AM

Archived from groups: alt.sys.pc-clone.dell (More info?)

"MB_" <mel@prodigy.invalid.net> wrote in message
news:46tUe.33849$1g2.5062@fe05.lga...
> My new notebook came with the 8-cell Lithium Ion Battery.
>
> Suppose I use it and it has say 35% power left.
>
> Can I recharge the battery at that time?
>
> Well, I know I can, but do these batteries have "memories" in the sense
> that you get better battery life by waiting for it to discharge almost
> completely or completely before recharging it??
>
> Mel
>

Most modern laptop batteries are Lithium Ion (LIon), and are much less prone
to memory effect. However, there are some guidelines to follow.

Your laptop battery will come charged (however it will not be a full
charge). It is essential to follow the manufacturer recommendation and
charge the battery for at least 12 hours the first time. The battery will
indicate a full charge in less than this period of time, but this first
charge should be for the full 12 hours. After the battery is charged, run
the laptop from the battery until the battery is depleted. Charge again for
at least 8 hours. This initial sequence will "condition" the battery for
maximum use. It is also not a good idea to leave the battery in the laptop
if it is to be connected to an electrical outlet for any length of time.

At least once a month, you should let the battery completely discharge and
then give a full over-night charge. This will keep the battery conditioned
and will give it a longer useful life-span. If a battery is not going to be
used for several weeks, it is best to let it discharge and store it in a
discharged state, and then when the battery is used again, treat it as a new
battery and charge it 12 hours...etc.

Bobby
Related resources
Anonymous
September 10, 2005 6:25:44 PM

Archived from groups: alt.sys.pc-clone.dell (More info?)

Bobby:

That is rather the antithesis of what the manual says!!!

It says to leave the battery in when using AC power.
It says to charge it for 3 hours.

Mel
"NoNoBadDog!" <no_@spam_verizon.net> wrote in message
news:XMuUe.325$XO6.295@trnddc03...
>
> "MB_" <mel@prodigy.invalid.net> wrote in message
> news:46tUe.33849$1g2.5062@fe05.lga...
>> My new notebook came with the 8-cell Lithium Ion Battery.
>>
>> Suppose I use it and it has say 35% power left.
>>
>> Can I recharge the battery at that time?
>>
>> Well, I know I can, but do these batteries have "memories" in the sense
>> that you get better battery life by waiting for it to discharge almost
>> completely or completely before recharging it??
>>
>> Mel
>>
>
> Most modern laptop batteries are Lithium Ion (LIon), and are much less
> prone to memory effect. However, there are some guidelines to follow.
>
> Your laptop battery will come charged (however it will not be a full
> charge). It is essential to follow the manufacturer recommendation and
> charge the battery for at least 12 hours the first time. The battery will
> indicate a full charge in less than this period of time, but this first
> charge should be for the full 12 hours. After the battery is charged, run
> the laptop from the battery until the battery is depleted. Charge again
> for at least 8 hours. This initial sequence will "condition" the battery
> for maximum use. It is also not a good idea to leave the battery in the
> laptop if it is to be connected to an electrical outlet for any length of
> time.
>
> At least once a month, you should let the battery completely discharge and
> then give a full over-night charge. This will keep the battery
> conditioned and will give it a longer useful life-span. If a battery is
> not going to be used for several weeks, it is best to let it discharge and
> store it in a discharged state, and then when the battery is used again,
> treat it as a new battery and charge it 12 hours...etc.
>
> Bobby
>
>
Anonymous
September 10, 2005 7:47:28 PM

Archived from groups: alt.sys.pc-clone.dell (More info?)

"MB_" <mel@prodigy.invalid.net> wrote in message
news:46tUe.33849$1g2.5062@fe05.lga...
> My new notebook came with the 8-cell Lithium Ion Battery.
>
> Suppose I use it and it has say 35% power left.
>
> Can I recharge the battery at that time?
>
> Well, I know I can, but do these batteries have "memories" in the sense
> that you get better battery life by waiting for it to discharge almost
> completely or completely before recharging it??
>
> Mel
>
Have a look at http://www.batteryuniversity.com/parttwo-34.htm
Anonymous
September 10, 2005 10:12:41 PM

Archived from groups: alt.sys.pc-clone.dell (More info?)

Olf:

THANK YOU VERY MUCH FOR THAT SITE REFERENCE!

It was very interesting with a lot of useful information.

I will be charging the battery more frequently and not letting it run way
down!


In case anyone else is following this thread, here is a summary:

Simple Guidelines

a.. Avoid frequent full discharges because this puts additional strain on
the battery. Several partial discharges with frequent recharges are better
for lithium-ion than one deep one. Recharging a partially charged
lithium-ion does not cause harm because there is no memory. (In this
respect, lithium-ion differs from nickel-based batteries.) Short battery
life in a laptop is mainly cause by heat rather than charge / discharge
patterns.


b.. Batteries with fuel gauge (laptops) should be calibrated by applying a
deliberate full discharge once every 30 charges. Running the pack down in
the equipment does this. If ignored, the fuel gauge will become increasingly
less accurate and in some cases cut off the device prematurely.


c.. Keep the lithium-ion battery cool. Avoid a hot car. For prolonged
storage, keep the battery at a 40% charge level.


d.. Consider removing the battery from a laptop when running on fixed
power. (Some laptop manufacturers are concerned about dust and moisture
accumulating inside the battery casing.)


e.. Avoid purchasing spare lithium-ion batteries for later use. Observe
manufacturing date. Do not buy old stock, even if sold at clearance prices.


f.. If you have a spare lithium-ion battery, use one to the fullest and
keep the other cool by placing it in the refrigerator. Do not freeze the
battery. For best results, store the battery at 40% state-of-charge.

Mel
_________________________
"olfart" <olfart65@excite.com> wrote in message
news:3ogrihF5rdr6U1@individual.net...
>
> "MB_" <mel@prodigy.invalid.net> wrote in message
> news:46tUe.33849$1g2.5062@fe05.lga...
>> My new notebook came with the 8-cell Lithium Ion Battery.
>>
>> Suppose I use it and it has say 35% power left.
>>
>> Can I recharge the battery at that time?
>>
>> Well, I know I can, but do these batteries have "memories" in the sense
>> that you get better battery life by waiting for it to discharge almost
>> completely or completely before recharging it??
>>
>> Mel
>>
> Have a look at http://www.batteryuniversity.com/parttwo-34.htm
>
Anonymous
September 11, 2005 12:38:13 AM

Archived from groups: alt.sys.pc-clone.dell (More info?)

Do as you wish, but what I posted will give you the best performance and
lifespan from the battery. If you trust the manual more than real world
experience, then by all means go ahead and follow their instructions.

I just don;t like throwing money away on batteries that die prematurely
because they are used wrong.

(Hint: maybe the manual is worded that way so you will be buying batteries
more often from them).

Bobby

"MB_" <mel@prodigy.invalid.net> wrote in message
news:o yFUe.9367$tc7.684@fe03.lga...
> Bobby:
>
> That is rather the antithesis of what the manual says!!!
>
> It says to leave the battery in when using AC power.
> It says to charge it for 3 hours.
>
> Mel
> "NoNoBadDog!" <no_@spam_verizon.net> wrote in message
> news:XMuUe.325$XO6.295@trnddc03...
>>
>> "MB_" <mel@prodigy.invalid.net> wrote in message
>> news:46tUe.33849$1g2.5062@fe05.lga...
>>> My new notebook came with the 8-cell Lithium Ion Battery.
>>>
>>> Suppose I use it and it has say 35% power left.
>>>
>>> Can I recharge the battery at that time?
>>>
>>> Well, I know I can, but do these batteries have "memories" in the sense
>>> that you get better battery life by waiting for it to discharge almost
>>> completely or completely before recharging it??
>>>
>>> Mel
>>>
>>
>> Most modern laptop batteries are Lithium Ion (LIon), and are much less
>> prone to memory effect. However, there are some guidelines to follow.
>>
>> Your laptop battery will come charged (however it will not be a full
>> charge). It is essential to follow the manufacturer recommendation and
>> charge the battery for at least 12 hours the first time. The battery
>> will indicate a full charge in less than this period of time, but this
>> first charge should be for the full 12 hours. After the battery is
>> charged, run the laptop from the battery until the battery is depleted.
>> Charge again for at least 8 hours. This initial sequence will
>> "condition" the battery for maximum use. It is also not a good idea to
>> leave the battery in the laptop if it is to be connected to an electrical
>> outlet for any length of time.
>>
>> At least once a month, you should let the battery completely discharge
>> and then give a full over-night charge. This will keep the battery
>> conditioned and will give it a longer useful life-span. If a battery is
>> not going to be used for several weeks, it is best to let it discharge
>> and store it in a discharged state, and then when the battery is used
>> again, treat it as a new battery and charge it 12 hours...etc.
>>
>> Bobby
>>
>>
>
>
Anonymous
September 11, 2005 12:25:39 PM

Archived from groups: alt.sys.pc-clone.dell (More info?)

On Sat, 10 Sep 2005, NoNoBadDog! wrote:

> Most modern laptop batteries are Lithium Ion (LIon), and are much less prone
> to memory effect. However, there are some guidelines to follow.
>
> Your laptop battery will come charged (however it will not be a full
> charge). It is essential to follow the manufacturer recommendation and
> charge the battery for at least 12 hours the first time. The battery will
> indicate a full charge in less than this period of time, but this first
> charge should be for the full 12 hours. After the battery is charged, run
> the laptop from the battery until the battery is depleted. Charge again for
> at least 8 hours. This initial sequence will "condition" the battery for
> maximum use. It is also not a good idea to leave the battery in the laptop
> if it is to be connected to an electrical outlet for any length of time.
>
> At least once a month, you should let the battery completely discharge and
> then give a full over-night charge. This will keep the battery conditioned
> and will give it a longer useful life-span. If a battery is not going to be
> used for several weeks, it is best to let it discharge and store it in a
> discharged state, and then when the battery is used again, treat it as a new
> battery and charge it 12 hours...etc.

What great advice :) . My daughter is thinking of getting a laptop sometime
this winter. I have put your post in my 'save' file to print up for her if
she does as she will be a complete newcomer to laptops and I have no
experience with them either. THanks :) .

Marilyn B.
Anonymous
September 11, 2005 12:30:06 PM

Archived from groups: alt.sys.pc-clone.dell (More info?)

On Sat, 10 Sep 2005, NoNoBadDog! wrote:

> Do as you wish, but what I posted will give you the best performance and
> lifespan from the battery. If you trust the manual more than real world
> experience, then by all means go ahead and follow their instructions.
>
> I just don;t like throwing money away on batteries that die prematurely
> because they are used wrong.
>
> (Hint: maybe the manual is worded that way so you will be buying batteries
> more often from them).

LOL- being my very cynical self, regarding your "Hint", that was my exact
thought too :) .

Marilyn B.
Anonymous
September 13, 2005 4:54:48 AM

Archived from groups: alt.sys.pc-clone.dell (More info?)

MB_ wrote:

> My new notebook came with the 8-cell Lithium Ion Battery.
>
> Suppose I use it and it has say 35% power left.
>
> Can I recharge the battery at that time?

Any time for Li batteries - no memory. I have read that the practice of
deep discharging Li batteries a la NiMH ones is not a good idea.
Anonymous
September 13, 2005 11:40:03 AM

Archived from groups: alt.sys.pc-clone.dell (More info?)

This thread is crazy. Some say deep discharge, others say don't. How do we
know who to believe?




>
> I have read that the practice of deep discharging Li batteries a la NiMH
> ones is not a good idea.
Anonymous
September 13, 2005 12:16:57 PM

Archived from groups: alt.sys.pc-clone.dell (More info?)

"Brian K" <iibntgyea4 REMOVE_THIS@hotmail.com> wrote in message
news:nnvVe.41891$FA3.10982@news-server.bigpond.net.au...
> This thread is crazy. Some say deep discharge, others say don't. How do we
> know who to believe?
>
>
>
>
>>
>> I have read that the practice of deep discharging Li batteries a la NiMH
>> ones is not a good idea.
>
>
What is not good is continual repeated deep discharges. The battery should
be completely cycled once every 30 days. running the battery to complete
depletion every time you use it is what is not good for the battery.

Bobby
Anonymous
September 13, 2005 1:41:22 PM

Archived from groups: alt.sys.pc-clone.dell (More info?)

Now that's my understanding too. Anyone who feels strongly that this is
incorrect?



>>
> What is not good is continual repeated deep discharges. The battery
> should be completely cycled once every 30 days. running the battery to
> complete depletion every time you use it is what is not good for the
> battery.
>
> Bobby
>
>
!