OT: cordless screwdriver

P

Pimpom

Guest
Is anyone familiar with the cordless screwdriver in the link or a
similar one? I'd like to know if using rechargeable 1.2V NiCd or
NiMH cells instead of the specified 1.5V alkalines will result in
a severely reduced torque.
http://www.ebay.com/itm/Black-Decker-6-Volt-Alkaline-4-AA-Battery-Operated-Cordless-SCREWDRIVER-NEW-/251240800353?pt=Power_Tools&hash=item3a7f1e6061
 
"Pimpom"
Is anyone familiar with the cordless screwdriver in the link or a similar
one? I'd like to know if using rechargeable 1.2V NiCd or NiMH cells
instead of the specified 1.5V alkalines will result in a severely reduced
torque.
Click to expand...

** The torque may well be better with rechargeable cells in use.

Under heavy load, the voltage from alkalines drops significantly while the
others hold up.



..... Phil
 
Phil Allison wrote:
"Pimpom"

Is anyone familiar with the cordless screwdriver in the link
or a
similar one? I'd like to know if using rechargeable 1.2V NiCd
or
NiMH cells instead of the specified 1.5V alkalines will result
in a
severely reduced torque.


** The torque may well be better with rechargeable cells in
use.

Under heavy load, the voltage from alkalines drops
significantly
while the others hold up.

Thanks, Phil. I need a handy cordless screwdriver, not the bulky
Click to expand...
heavy-duty drill-cum-screwdriver type. The one I had died some
time ago and I'm weighing a built-in battery type against one
using AAs - the convenience of the built-in type against the fact
that the battery's likely to degrade in a few years and a
replacement is not likely to be available to me.
 
"asdf"
Not sure if the small difference in voltage would affect its operation
but NiCd batteries would give much more torque than NiMh ones due to
their lower internal resistance.
Click to expand...
** There is simply no difference.

NiMh cells matched NiCd in that respect long ago - but with much greater
mAh.




.... Phil
 
On Sat, 09 Mar 2013 11:52:20 +0530, Pimpom wrote:

Is anyone familiar with the cordless screwdriver in the link or a
similar one? I'd like to know if using rechargeable 1.2V NiCd or NiMH
cells instead of the specified 1.5V alkalines will result in a severely
reduced torque.
http://www.ebay.com/itm/Black-Decker-6-Volt-Alkaline-4-AA-Battery-
Operated-Cordless-SCREWDRIVER-NEW-/251240800353?
Click to expand...
pt=Power_Tools&hash=item3a7f1e6061

Not sure if the small difference in voltage would affect its operation
but NiCd batteries would give much more torque than NiMh ones due to
their lower internal resistance.
 
Pimpom Inscribed thus:

Is anyone familiar with the cordless screwdriver in the link or a
similar one? I'd like to know if using rechargeable 1.2V NiCd or
NiMH cells instead of the specified 1.5V alkalines will result in
a severely reduced torque.

http://www.ebay.com/itm/Black-Decker-6-Volt-Alkaline-4-AA-Battery-Operated-Cordless-SCREWDRIVER-NEW-/251240800353?pt=Power_Tools&hash=item3a7f1e6061
Click to expand...

I've got one very similar that I put MiMH cells into. I've not noticed
any slowdown. It does seem to weed out a poor cell very quickly, one
getting discharged far faster than the others.

--
Best Regards:
Baron.
 
On Sun, 10 Mar 2013 00:06:51 +1100, Phil Allison wrote:

NiMh cells matched NiCd in that respect long ago - but with much greater
mAh.
Click to expand...
I experienced this difference myself years ago when swapping my mini
kitchen vacuum cleaner old 1.6 Ah NiCd battery pack with a 2.1 NiMh one
made with fresh store bought branded cells.
The NiMh pack let the motor run a lot slower, albeit lasting much longer
than the old NiCd cells, which is what one would expect by a fresh and
more powerful current source having a higher internal resistance.
Those NiMh cells once put back in other appliances worked fine for years,
I still have most of them operating after about 10 years.

Some searches brought similar results from other people along with the
explanation: for power hungry devices NiCd cells are preferable due to
lower internal resistance.
I'm not aware of new developments in the field though, or about
industrial grade batteries, only speaking of commonly available NiMh
cells.
 
"asdf" <asdf@nospam.com> wrote in message
news:khin75$obl$1@speranza.aioe.org...
On Sun, 10 Mar 2013 00:06:51 +1100, Phil Allison wrote:

NiMh cells matched NiCd in that respect long ago - but with much greater
mAh.

I experienced this difference myself years ago when swapping my mini
kitchen vacuum cleaner old 1.6 Ah NiCd battery pack with a 2.1 NiMh one
made with fresh store bought branded cells.
The NiMh pack let the motor run a lot slower, albeit lasting much longer
than the old NiCd cells,
Click to expand...
A while ago the NiCd cells in my shaver died and I couldn't find anywhere
that still sells NiCd. While the NiMh cells I tried have about double the Ah
capacity, they only ran the shaver about 1/4 - 1/3 of the length of time.

It was fairly noticeable that the NiMh cells were getting fairly warm under
load - so that's where all the energy was going!

Unfortunately I'd bought a lot of early NiMh cells at good prices some time
ago - apparently more modern ones have lower internal resistance.
 
On Sun, 10 Mar 2013 22:37:33 -0000, "Ian Field"
<gangprobing.alien@ntlworld.com> wrote:

"asdf" <asdf@nospam.com> wrote in message
news:khin75$obl$1@speranza.aioe.org...
On Sun, 10 Mar 2013 00:06:51 +1100, Phil Allison wrote:

NiMh cells matched NiCd in that respect long ago - but with much greater
mAh.

I experienced this difference myself years ago when swapping my mini
kitchen vacuum cleaner old 1.6 Ah NiCd battery pack with a 2.1 NiMh one
made with fresh store bought branded cells.
The NiMh pack let the motor run a lot slower, albeit lasting much longer
than the old NiCd cells,

A while ago the NiCd cells in my shaver died and I couldn't find anywhere
that still sells NiCd.
Click to expand...
---
http://www.batterybob.com/googlesearchresults.asp?cx=002871419911360800563%3A7eqzgsumivs&cof=FORID%3A11&ie=UTF-8&q=NiCd&sa=Google+Search
---

While the NiMh cells I tried have about double the Ah
capacity, they only ran the shaver about 1/4 - 1/3 of the length of time.
Click to expand...
---
Should've done your homework instead of ass uming that they were 1:1
replacements, huh?
---

It was fairly noticeable that the NiMh cells were getting fairly warm under
load - so that's where all the energy was going!
Click to expand...
---
But why?
---

Unfortunately I'd bought a lot of early NiMh cells at good prices some time
ago - apparently more modern ones have lower internal resistance.
Click to expand...
Perhaps.

What can you tell us about the internal resistance of older NiMH cells
with respect to newer ones?

--
JF
 
Ian Field wrote:
"asdf" <asdf@nospam.com> wrote in message
news:khin75$obl$1@speranza.aioe.org...
On Sun, 10 Mar 2013 00:06:51 +1100, Phil Allison wrote:

NiMh cells matched NiCd in that respect long ago - but with
much
greater mAh.

I experienced this difference myself years ago when swapping
my mini
kitchen vacuum cleaner old 1.6 Ah NiCd battery pack with a 2.1
NiMh
one made with fresh store bought branded cells.
The NiMh pack let the motor run a lot slower, albeit lasting
much
longer than the old NiCd cells,

A while ago the NiCd cells in my shaver died and I couldn't
find
anywhere that still sells NiCd. While the NiMh cells I tried
have
about double the Ah capacity, they only ran the shaver about
1/4 -
1/3 of the length of time.
It was fairly noticeable that the NiMh cells were getting
fairly warm
under load - so that's where all the energy was going!

Unfortunately I'd bought a lot of early NiMh cells at good
prices
some time ago - apparently more modern ones have lower internal
resistance.
Click to expand...
NiCds are still easily available here in India - one of the
"advantages" of being not as advanced as the West. If I decide to
use NiMH types, they'll be Eneloops although, Ah for Ah, an
eneloop costs twice as much as a NiCd.

Can anyone point to a reliable comparison between Eneloops and
NiCds regarding performance under load? Phil?
 
"Pimpom"

Can anyone point to a reliable comparison between Eneloops and NiCds
regarding performance under load? Phil?
Click to expand...

** There will be no difference in terminal voltage with any load that takes
an hour or more to consume the cell's charge.

RC models are pretty much the only things that devour cells faster than
hat - and they have gone over to NiMH almost entirely.

FYI:

The internal resistance of good quality AA size NiCd OR NiMH cells is less
than 20mohms.


.... Phil
 
"John Fields" <jfields@austininstruments.com> wrote in message
news:7q4qj81de026chvqh3af4p51japlu3n3a4@4ax.com...
On Sun, 10 Mar 2013 22:37:33 -0000, "Ian Field"
gangprobing.alien@ntlworld.com> wrote:



"asdf" <asdf@nospam.com> wrote in message
news:khin75$obl$1@speranza.aioe.org...
On Sun, 10 Mar 2013 00:06:51 +1100, Phil Allison wrote:

NiMh cells matched NiCd in that respect long ago - but with much
greater
mAh.

I experienced this difference myself years ago when swapping my mini
kitchen vacuum cleaner old 1.6 Ah NiCd battery pack with a 2.1 NiMh one
made with fresh store bought branded cells.
The NiMh pack let the motor run a lot slower, albeit lasting much longer
than the old NiCd cells,

A while ago the NiCd cells in my shaver died and I couldn't find anywhere
that still sells NiCd.

---
http://www.batterybob.com/googlesearchresults.asp?cx=002871419911360800563%3A7eqzgsumivs&cof=FORID%3A11&ie=UTF-8&q=NiCd&sa=Google+Search
---

While the NiMh cells I tried have about double the Ah
capacity, they only ran the shaver about 1/4 - 1/3 of the length of time.

---
Should've done your homework instead of ass uming that they were 1:1
replacements, huh?
---

It was fairly noticeable that the NiMh cells were getting fairly warm
under
load - so that's where all the energy was going!

---
But why?
---

Unfortunately I'd bought a lot of early NiMh cells at good prices some
time
ago - apparently more modern ones have lower internal resistance.

Perhaps.
Click to expand...

Go away you confused boring old druggie.
 
On Mon, 11 Mar 2013 17:12:59 -0000, "Ian Field"
<gangprobing.alien@ntlworld.com> wrote:

"John Fields" <jfields@austininstruments.com> wrote in message
news:7q4qj81de026chvqh3af4p51japlu3n3a4@4ax.com...
On Sun, 10 Mar 2013 22:37:33 -0000, "Ian Field"
gangprobing.alien@ntlworld.com> wrote:



"asdf" <asdf@nospam.com> wrote in message
news:khin75$obl$1@speranza.aioe.org...
On Sun, 10 Mar 2013 00:06:51 +1100, Phil Allison wrote:

NiMh cells matched NiCd in that respect long ago - but with much
greater
mAh.

I experienced this difference myself years ago when swapping my mini
kitchen vacuum cleaner old 1.6 Ah NiCd battery pack with a 2.1 NiMh one
made with fresh store bought branded cells.
The NiMh pack let the motor run a lot slower, albeit lasting much longer
than the old NiCd cells,

A while ago the NiCd cells in my shaver died and I couldn't find anywhere
that still sells NiCd.

---
http://www.batterybob.com/googlesearchresults.asp?cx=002871419911360800563%3A7eqzgsumivs&cof=FORID%3A11&ie=UTF-8&q=NiCd&sa=Google+Search
---

While the NiMh cells I tried have about double the Ah
capacity, they only ran the shaver about 1/4 - 1/3 of the length of time.

---
Should've done your homework instead of ass uming that they were 1:1
replacements, huh?
---

It was fairly noticeable that the NiMh cells were getting fairly warm
under
load - so that's where all the energy was going!

---
But why?
---

Unfortunately I'd bought a lot of early NiMh cells at good prices some
time
ago - apparently more modern ones have lower internal resistance.

Perhaps.


Go away you confused boring old druggie.
Click to expand...
---
Geez, if I did you'd have no one to play with, you obsequious little
twat!

--
JF
 
On Mon, 11 Mar 2013 15:35:33 -0500, John Fields
<jfields@austininstruments.com> wrote:

On Mon, 11 Mar 2013 17:12:59 -0000, "Ian Field"
gangprobing.alien@ntlworld.com> wrote:



"John Fields" <jfields@austininstruments.com> wrote in message
news:7q4qj81de026chvqh3af4p51japlu3n3a4@4ax.com...
On Sun, 10 Mar 2013 22:37:33 -0000, "Ian Field"
gangprobing.alien@ntlworld.com> wrote:



"asdf" <asdf@nospam.com> wrote in message
news:khin75$obl$1@speranza.aioe.org...
On Sun, 10 Mar 2013 00:06:51 +1100, Phil Allison wrote:

NiMh cells matched NiCd in that respect long ago - but with much
greater
mAh.

I experienced this difference myself years ago when swapping my mini
kitchen vacuum cleaner old 1.6 Ah NiCd battery pack with a 2.1 NiMh one
made with fresh store bought branded cells.
The NiMh pack let the motor run a lot slower, albeit lasting much longer
than the old NiCd cells,

A while ago the NiCd cells in my shaver died and I couldn't find anywhere
that still sells NiCd.

---
http://www.batterybob.com/googlesearchresults.asp?cx=002871419911360800563%3A7eqzgsumivs&cof=FORID%3A11&ie=UTF-8&q=NiCd&sa=Google+Search
---

While the NiMh cells I tried have about double the Ah
capacity, they only ran the shaver about 1/4 - 1/3 of the length of time.

---
Should've done your homework instead of ass uming that they were 1:1
replacements, huh?
---

It was fairly noticeable that the NiMh cells were getting fairly warm
under
load - so that's where all the energy was going!

---
But why?
---

Unfortunately I'd bought a lot of early NiMh cells at good prices some
time
ago - apparently more modern ones have lower internal resistance.

Perhaps.


Go away you confused boring old druggie.

---
Geez, if I did you'd have no one to play with, you obsequious little
twat!
Click to expand...
Ian is one of Larkin's bastard children.

...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
"Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote in
message news:drmsj8t50op6e9qg823tjfhotd3ftk8oas@4ax.com...
On Mon, 11 Mar 2013 15:35:33 -0500, John Fields
jfields@austininstruments.com> wrote:

On Mon, 11 Mar 2013 17:12:59 -0000, "Ian Field"
gangprobing.alien@ntlworld.com> wrote:



"John Fields" <jfields@austininstruments.com> wrote in message
news:7q4qj81de026chvqh3af4p51japlu3n3a4@4ax.com...
On Sun, 10 Mar 2013 22:37:33 -0000, "Ian Field"
gangprobing.alien@ntlworld.com> wrote:



"asdf" <asdf@nospam.com> wrote in message
news:khin75$obl$1@speranza.aioe.org...
On Sun, 10 Mar 2013 00:06:51 +1100, Phil Allison wrote:

NiMh cells matched NiCd in that respect long ago - but with much
greater
mAh.

I experienced this difference myself years ago when swapping my mini
kitchen vacuum cleaner old 1.6 Ah NiCd battery pack with a 2.1 NiMh
one
made with fresh store bought branded cells.
The NiMh pack let the motor run a lot slower, albeit lasting much
longer
than the old NiCd cells,

A while ago the NiCd cells in my shaver died and I couldn't find
anywhere
that still sells NiCd.

---
http://www.batterybob.com/googlesearchresults.asp?cx=002871419911360800563%3A7eqzgsumivs&cof=FORID%3A11&ie=UTF-8&q=NiCd&sa=Google+Search
---

While the NiMh cells I tried have about double the Ah
capacity, they only ran the shaver about 1/4 - 1/3 of the length of
time.

---
Should've done your homework instead of ass uming that they were 1:1
replacements, huh?
---

It was fairly noticeable that the NiMh cells were getting fairly warm
under
load - so that's where all the energy was going!

---
But why?
---

Unfortunately I'd bought a lot of early NiMh cells at good prices some
time
ago - apparently more modern ones have lower internal resistance.

Perhaps.


Go away you confused boring old druggie.

---
Geez, if I did you'd have no one to play with, you obsequious little
twat!

Ian is one of Larkin's bastard children.

...Jim Thompson
Click to expand...

JF & JT are bum chums.
 
On Mon, 11 Mar 2013 22:45:44 -0000, "Ian Field"
<gangprobing.alien@ntlworld.com> wrote:


JF & JT are bum chums.
Click to expand...
---
Perhaps, but only because we'd have your ever-receptive quivering bum
in common.

--
JF
 
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