Laptop batteries

[MrKnisely]

Larry Grover wrote:

> MrKnisely wrote:
>
>> Christoph Bier wrote:
>>
>>> Phil Cooper schrieb am 06.01.2006 22:26:
>>>
>>>  
>>>
>>>> Hi;
>>>>
>>>> This is probably more of a hardware question than an Ubuntu one, 
>>>> but  you guys seem to know your stuff! I have a HP laptop running 
>>>> Ubuntu,  and it never goes any where - it's my main "desktop" 
>>>> machine and it  stays plugged in at least 80%+ of the time. My 
>>>> question is, would it  be better for the battery if I removed it 
>>>> altogether, or does it  being sat in the laptop with power not 
>>>> adversely affect it?
>>>>   
>>>
>>>
>>>
>>> Heat decreases lifetime of the battery. That's why I always remove
>>> the battery of my laptop when it's on AC (it's very easy with my
>>> laptop).
>>>
>>> Best,
>>>   Christoph
>>>  
>>>
>> I agree with Christoph.
>>
>> Mike K.
>>
>
>
> While it's true that excessive heat has a negative effect on battery 
> life, the specific location of the battery in any given laptop may not 
> expose it to much heat, depending on how the laptop is constructed.  
> For example, in my laptop the battery is in the coolest part of the 
> laptop, far from the "hot spots" -- it doesn't get much hotter in the 
> laptop than it would if it was removed and simply exposed to ambient 
> temperature.
>
> Older laptop batteries (NiMH) were subject to a pronounced "memory" 
> effect.  If these batteries received partial, shallow 
> discharge/recharge cycles over and over again, they would lose 
> capacity.  Newer laptop batteries (Li-ion) suffer much less from this 
> effect.
>
> Removing the battery while the laptop is on AC might extend the life 
> of the battery somewhat (how much?), but I can think of two good 
> reasons *not* to remove the battery while on AC:
>
> (1) Unless you run your laptop on a UPS, if you have a power 
> interruption your laptop will shut off immediately.  This is never a 
> good thing.  Even with journaling filesystems, you are likely to lose 
> some information.
>
> (2) Laziness.  Really, I'd rather not bother removing the battery (and 
> have to remember to replace it if I wanted to unplug the laptop and 
> carry is somewhere).
>
> Regards,
> Larry
>
I've got an HP Compaq nx9600 and EVERYTHING on this thing is hot.  This 
laptop could heat a small house if left on doing something processor 
intensive.

Mike K.