🚀 go-pugleaf

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:

"Storage in a cool place slows the aging process of lithium-ion (and other
chemistries). Manufacturers recommend storage temperatures of 15�C (59�F).
In addition, the battery should be partially charged during storage. The
manufacturer recommends a 40% charge."

"Lithium-ion offers good charging performance at cold and hot temperatures.
The acceptable charge range is 0� to 45�C (32�F to 113�F). It is
recommended, however, to reduce the charge rate to less than 1C at
temperatures of 5�C to 0�C (41�F to 32�F).
 It is important to know that consumer grade lithium-ion batteries cannot be
charged below 0�C (32�F). Although the packs appear to be charging normally
at freezing temperatures, the cell impedance goes up and the acceptance of
the ions on the anode is drastically reduced."

" Quality chargers reduce the charge current at cold temperatures and avert
a charge altogether below 0�C (32�F). When charging a cold battery, allow
the pack to warm up before putting it into the charger. Discharging a
lithium-ion battery at cold temperature does not cause any harm. The lower
performance will only be noticeable while the pack is dwelling in the cold
state."

" The recommended storage temperature for most batteries is 15�C (59�F).
While lead-acid batteries must always be kept at full charge, nickel and
lithium-based chemistries should be stored at 40% state-of-charge (SoC)."

"Lithium-ion powers most of today's laptop computers. The battery
compartment on many laptops rises to about 45�C (113�F) during operation.
The combination of high charge level and elevated ambient temperature
presents an unfavorable condition for the battery. This explains the short
lifespan of many laptop batteries."

Buffalo