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Posted by Tony Hwang on February 19, 2007, 8:59 pm
a1esta wrote:
>
>>Most manufacturers will state that the life of batteries in terms of
>>the number of charging and discharging cycles. I remember reading from
>>somewhere that rechargeable batteries has a shelf life even when the
>>batteries are not used.
>>
>>For e.g., when the batteries are not being used, they will still be
>>"dead" say after 24 months or so. I also heard that for infreqently
>>used rechargeable batteries, it is necessary to store them at a very
>>low temperature (about 10 deg. C) in order to to prolong the shelf
>>life.
>>
>>I intend to buy a cordless screw driver mainly for use in driving
>>screws on cabinets, walls etc. And I will use it only about 3 to 4
>>times per year. And if the batteries really have shelf life, it would
>>not be econimcal. Would it be better to get the corded tool instead?
>>
>>Thanks!
>
>
> Just to clarify what I said:
>
> For e.g., when the batteries are not being used, they will still be
>
>>"dead" say after 24 months or so. I also heard that for infreqently
>>used rechargeable batteries, it is necessary to store them at a very
>>low temperature (about 10 deg. C) in order to to prolong the shelf
>>life.
>
>
> The "dead" means it cannot be recharge or revived again.
>
Hi,
Self discharge is through the internal resistance. Warm temp. makes the
chemicals more active. There are many different kinds of rechargeables.
They have individual charge/discharge characteristics.
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