🚀 go-pugleaf

Somewhere on teh intarwebs Meat Plow wrote:
> On Thu, 13 Aug 2009 08:52:46 -0600, "Buffalo"
> <Eric@nada.com.invalid>wrote:
>> Meat Plow wrote:
>>> On Thu, 13 Aug 2009 08:34:41 -0600, "Buffalo"
>>> <Eric@nada.com.invalid>wrote:
>>>> Meat Plow wrote:
>>>>> On Thu, 13 Aug 2009 06:22:15 -0700 (PDT), starved@rock.comwrote:
>>>>>
>>>>>> Brand new Dell Inspiron 1545 laptop purchased last week. At this
>>>>>> time the system will be used as a desktop, running on AC power
>>>>>> continously.
>>>>>>
>>>>>> According to http://www.batteryuniversity.com and other sources,
>>>>>> leaving the battery in - while always running on AC power and
>>>>>> never on battery power - will shorten the life of the battery.
>>>>>>
>>>>>> So the battery's been removed, and with a 40% charge on it, it's
>>>>>> in a ziplock bag and stored in the refrigerator.
>>>>>>
>>>>>> The plan is to remove it from storage after some time, put it
>>>>>> back in the laptop, recharge it back up to 40%, and then store
>>>>>> it in the refrigerator again. This cycle will be repeated
>>>>>> indefinitely.
>>>>>>
>>>>>> My questions are:
>>>>>>
>>>>>> 1. How long can the battery remain stored in the refrigerator
>>>>>> before it has to be recharged? One month? Two months?
>>>>>>
>>>>>> 2. Should I be concerned about corrosion of the contacts or dust
>>>>>> buildup in an empty battery compartment?
>>>>>>
>>>>>> Any help would be greatly appreciated. Thanks!
>>>>>>
>>>>>> - Dave
>>>>>
>>>>> Lithium Ion batteries have a finite number of charges. Has nothing
>>>>> to do with leaving it in the laptop while on AC provided the power
>>>>> functions of the laptop work as designed.
>>>>
>>>> From the link the OP supplied:
>>>
>>> <snip>
>>>
>>> Doesn't apply to my experience, YMMV. Refrigeration may increase the
>>> shelf life but the bottom line is still charge cycles.
>>
>> I agree with you on the charge cycles being finite and one of the
>> limiting factors.
>> Leaving it in the laptop subjects it to above room temps and
>> shortens its ability to regain its capacity.
>> The chart on the link posted by Dave was pretty enlightening.
>> Buffalo
>>
>
> Depends on where the battery is located. Don't assume all laptop
> battery packs are mounted close to sources of heat.
>
> On my two laptops the battery pack is up front away from heat sources.
> Both were new in 2004. Both still run 2 hours on a charge as they did
> 5 years ago. Both have remained attached for their entire life so far
> and show no appreciable decrease in capacity.
>
> There are plenty of arguments for and against removal while using as a
> desktop. I'm for removal as long as it doesn't compromise the laptop's
> physical well being like (but not limited to) allowing foreign objects
> to infiltrate or interfering with the laptop's electronics.

Not to mention cooling. If there are 'apertures' exposed by removing the 
battery then air could be drawn in there when the fan is running, 
effectively short-circuiting the 'cooling path' and allowing some components 
to get too hot.

Luckilly for me my IBM/Lenovo T60 thinkPad (with an extended 9 cell battery) 
that I only use on mains has software that allows you to set the parameters 
for charging. (If not used as soon as charge drops to 95% then the battery 
is topped off and one more cycle is aded to the count.

I have my battery set to only charge when it drops to 40% and then to stop 
charging at 60%. As this machine (2.16GHz C2D T7400, 15" 4:3 IPS screen, 3GB 
RAM, ATI X1400/128MB, 320GB 7200rpm HDD) is no low-powered glorified pocket 
calculator it does use some power. I get 3.5 hours on a full charge so 
figure that, if I need to take it with me without warning, I'll get between 
one and just over two hours depending on where the battery level is within 
my parameters. (I have a spare adapter in my laptop bag as well.) Also, I 
hope that the battery will last longer than if it were constantly being 
topped off from 95%.

I have a few power outages here so, with that taken into consideration, 
would rather not run the machine batteryless. Having a battery is like 
having a built-in UPS.
-- 
Shaun.

"Give a man a fire and he's warm for the day. But set fire to him and he's 
warm for the rest of his life." Terry Pratchet, 'Jingo'.