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Posted by <aemeijers on February 19, 2007, 10:26 pm
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> 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.
Chuckle. If you use them daily, and deep-cycle them, you get near the
supposed lifespan. If you use them once in a while, or don't deep-cycle
them, expect them to die young. I have exactly one rechargable tool at
home, a 24v drill that I bought on sale (and on impulse) and like for small
jobs, but realistically I almost never work far from an outlet. At work, I
am Mama to about 100 rechargable walkie-talkies (real ones, like cops use),
and I only get 2-3 years out of the batteries, because I can't get the users
to deep-cycle them. When they are at their desks, they leave them in the
charger, and the battery exercisor can only do so much once they stop
holding a charge. And these are fancy supposedly memory-resistant batteries,
about 60 bucks a piece. If I ever replace this analog system with a trunked
digital, I'm gonna hang a dozen gang chargers on the wall by the coffee pot
or something, so they can't help but drain them.
But having said that- rechargeables are a whole lot better than they were 20
years ago. In an earlier life, I took pictures, and had several rechargable
flashes. Under occasional use, they all died in a year or so. My current
grab-first camera is a digital, and it holds a charge unused for at least a
month, where the old stuff would drain down in a couple days.
aem sends...
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Posted by Jim Yanik on February 20, 2007, 2:13 am
show/hide quoted text
> 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.
>
>
My first Makita 9.6V stick lasted 10 years when used daily,6095DW
drill,light usage,but daily,charged when drill speed began to drop.The next
stick only lasted a couple of years because it got very infrequent use.
--
Jim Yanik
jyanik
kua.net
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Posted by Edwin Pawlowski on February 19, 2007, 10:05 pm
show/hide quoted text
> 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?
Batteries have improved, but they will still deteriorate over time. Keeping
them cold is not going to help in the long run. In your situation, it is
difficult to monetarily justify a cordless tool knowing you will never get
full value of the batteries. If you get three to four years out of them,
you'd be about average, longer is a big plus. Only you can put a value on
the convenience of cordless.
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Posted by Sacramento Dave on February 19, 2007, 10:49 pm
show/hide quoted text
> 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!
After my Makita 7V went bad I bought the 9.6V Makita the batteries
seemed last at best 2 years I did use it a lot. After that I bought a Dewalt
14V they said the batteries could be charged about 1200 times. well I'm a
little over two years no where near 1200 and they charge but don't last
long. So hear I am again $50 for each battery or a whole new set up. I also
think Dewalt tools are way over rated. But now I just read about a new
design drill. what's deferent it has a electrical type cord attached to it,
then that hooks into a central power supply ( they do make extra length
cords you can add to it) The good part is you never have to charge it and
they say it should last over 20 years and best of all there actually
cheaper.
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Posted by Edwin Pawlowski on February 19, 2007, 11:32 pm
show/hide quoted text
> So hear I am again $50 for each battery or a whole new set up. I also
> think Dewalt tools are way over rated.
Check out www.primecell.com to have it rebuilt, often better than new
show/hide quoted text
> But now I just read about a new design drill. what's deferent it has a
> electrical type cord attached to it, then that hooks into a central power
> supply ( they do make extra length cords you can add to it) The good part
> is you never have to charge it and they say it should last over 20 years
> and best of all there actually cheaper.
What a concept. Next thing you know, they may start making telephones like
that.
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Page 2 of 5 < 1 2 3 > last >>
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>> 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.