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Cordless power tool batteries deteroriate with time? a1esta 02-19-2007
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Posted by a1esta on February 19, 2007, 8:14 pm


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!


Posted by a1esta on February 19, 2007, 8:33 pm


> 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.


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.

Posted by Joseph Meehan on February 19, 2007, 9:33 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!

Battery technology keeps changing. My experience tells me that current
batteries are good for maybe 3-8 years total time if treated well.

In your case I would suggest making a plan to recharge them on a
schedule maybe every two or three months. Letting them totally discharge is
not good.


--
Joseph Meehan

Dia 's Muire duit




Posted by hallerb@aol.com on February 19, 2007, 9:57 pm


wrote:
> 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 =A0rechargeable 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!
>
> =A0 =A0 Battery technology keeps changing. =A0My experience tells me that=
current
> batteries are good for maybe 3-8 years total time if treated well.
>
> =A0 =A0 In your case I would suggest making a plan to recharge them on a
> schedule maybe every two or three months. Letting them totally discharge =
is
> not good.
>
> --
> Joseph Meehan
>
> =A0Dia 's Muire duit- Hide quoted text -
>
> - Show quoted text -

I use almost all corded tools, having tired of batteries dying at the
worst possible time......

usually their capacity just gets less over time accelerating near end
of life, about 3 years for most battery packs today.

comanys should be required to make them accept standard cells for easy
replacement


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