Trickle charging NiCads

[RogerN]

"Phil Allison" <philallison@tpg.com.au> wrote in message
news:76rpebF1e76rmU1@mid.individual.net...

"RogerNutcase"

** = brain dead FUCKING LIAR.


You evidently seem to think....


** Total fuckheads like you do not get to sum up anything or anyone.


You claim the cc/cv charging would take very long, that is true, but how
would that readily lend itself to overcharging and thermal runaway?

** First rule of usenet posting is to always post questions and comments
UNDER the words you want to address.

Never re-phrase what another said and then ask them to respond to that.

Cos only lying cunts do that.


Your claims of short battery life would be true if we where talking about
NimH, overcharging them destroys them right away.

** False and irrelevant.


If you have better ideas, please share them, all you done so far is
recommend other batteries than the OP wants to use.


** Totally false and a damn lie - as anyone what reads this thread from
the beginning can see.

YOU are a congenital LIAR Roger.

FOAD.



.... Phil

Hide behind usenet and type what you want. Talk to me like that to my face
and I'll put your teeth through your brain and out the back of your skull.
Fuckhead Phil!

 

[Phil Allison]

"RogerNutcase"

** = brain dead FUCKING LIAR.

You evidently seem to think....


** Total fuckheads like you do not get to sum up anything or anyone.


You claim the cc/cv charging would take very long, that is true, but how
would that readily lend itself to overcharging and thermal runaway?

** First rule of usenet posting is to always post questions and comments
UNDER the words you want to address.

Never re-phrase what another said and then ask them to respond to that.

Cos only lying cunts do that.


Your claims of short battery life would be true if we where talking
about NimH, overcharging them destroys them right away.

** False and irrelevant.


If you have better ideas, please share them, all you done so far is
recommend other batteries than the OP wants to use.


** Totally false and a damn lie - as anyone what reads this thread from
the beginning can see.

YOU are a congenital LIAR Roger.

FOAD.


Hide behind usenet and type what you want. Talk to me like that to my
face and I'll put your teeth through your brain and out the back of your
skull.

** Temper, temper - my little autistic fiend.

Remember the old saying about sticks and stones ....

Then FOAD.


...... Phil

 

[RogerN]

"pimpom" <pimpom@invalid.invalid> wrote in message
news:gu7991$3or$1@news.albasani.net...
<snip>

Hmmm. It looks as if there's no definitive answer. Would you say that
something like C/20 would be a reasonable compromise?

Here's some info:

2.13) So, what's the right charge current?
Depends. If using an unregulated charger -- one that doesn't do any
detection of full charge, then one must restrict your charge current to the
overcharge capacity of your cell. All NiCd cells I have seen can handle C/10
(approx. 50 mA for AA cell) indefinitely without venting. This is not to say
that one won't get voltage depression, but rather that one won't destroy the
cell(s).

http://www.repairfaq.org/ELE/F_NiCd_Battery.html#NICDBATTERY_002

RogerN

 

[Michael A. Terrell]

RogerN wrote:

Hide behind usenet and type what you want. Talk to me like that to my face
and I'll put your teeth through your brain and out the back of your skull.
Fuckhead Phil!

Roger, Phil is has mental problems and either can't afford, or won't
take his medication most of the time. Just kill file him, or he'll be
butting into very thread you post to.

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

http://www.flickr.com/photos/materrell/

 

[RogerN]

"RogerN" <regor@midwest.net> wrote in message
news:W-2dnRH7Q6Sbe5XXnZ2dnUVZ_v2dnZ2d@earthlink.com...

"pimpom" <pimpom@invalid.invalid> wrote in message
news:gu7991$3or$1@news.albasani.net...
snip
Hmmm. It looks as if there's no definitive answer. Would you say that
something like C/20 would be a reasonable compromise?

Here's some info:

2.13) So, what's the right charge current?
Depends. If using an unregulated charger -- one that doesn't do any
detection of full charge, then one must restrict your charge current to
the overcharge capacity of your cell. All NiCd cells I have seen can
handle C/10 (approx. 50 mA for AA cell) indefinitely without venting. This
is not to say that one won't get voltage depression, but rather that one
won't destroy the cell(s).

http://www.repairfaq.org/ELE/F_NiCd_Battery.html#NICDBATTERY_002

RogerN

And more:

What about trickle charging? As mentioned in Part 1, trickling is not really
necessary for NiCd's, since the C/10 rate is OK for virtually indefinite
charging without fear of overcharging. However, some chargers on the market
do offer an automatic switch-over to trickle charging after completing the
fast or overnight charge. A trickle charge is technically the C/20 rate or
lower, i.e., the current number obtained by halving the C/10 overnight rate.
http://www.electrodynam.com/rc/totm/totm1100.shtml

NiCd and NiMH cells have the advantage that they can be charged and
discharged rapidly. They are poor at slow rate discharges. NiCd cells became
popular because they can be charged gently indefinitely without gassing. A
typical charging arrangement is to charge the cells for 1.4 times their
capacity. A 1 Ah cell would normally be charged at 100mA for 14 hours but
could be charged for 20 hours or more at 100mA without damaging the cell.
http://homepage.ntlworld.com/wilf.james/nicads.htm

Slow charge rates (between 0.05 C and 0.1 C) are the most-often
recommended charge rate, since a battery can be recharged in less than a
day, without significant probability of damaging or degrading the battery.
Slow charge rates can be applied to a battery for an indefinite period of
time, meaning that the battery can be connected to the charger for days or
weeks with no need for special shut-off or current-limiting equipment on
the charger.
http://www.ncjrs.gov/txtfiles/172868.txtIndefinite constant current charging
acceptable at 10%
capacityhttp://www.trainweb.org/girr/tips/tips7/battery_rc_tips.htmlNickel-Cadmium:
NiCd batteries are charged with aconstant-current profile. NiCd batteries
can be continu-ously charged at the standard C/10 trickle rate indefi-nitely
without excessive temperature rise or damageNickel-Cadmium: NiCd batteries
are charged with aconstant-current profile. NiCd batteries can be
continu-ously charged at the standard C/10 trickle rate indefi-nitely
without excessive temperature rise or damageconstant-current profile. NiCd
batteries can be continu-ously charged at the standard C/10 trickle rate
indefi-nitely without excessive temperature rise or damagebatteries can be
continu-ously charged at the standard C/10 trickle rate indefi-nitely
without excessive temperatureRogerN

 

[pimpom]

RogerN wrote:

"RogerN" <regor@midwest.net> wrote in message
news:W-2dnRH7Q6Sbe5XXnZ2dnUVZ_v2dnZ2d@earthlink.com...

"pimpom" <pimpom@invalid.invalid> wrote in message
news:gu7991$3or$1@news.albasani.net...
snip
Hmmm. It looks as if there's no definitive answer. Would you say
that something like C/20 would be a reasonable compromise?

Here's some info:

2.13) So, what's the right charge current?
Depends. If using an unregulated charger -- one that doesn't do any
detection of full charge, then one must restrict your charge current
to the overcharge capacity of your cell. All NiCd cells I have seen
can handle C/10 (approx. 50 mA for AA cell) indefinitely without
venting. This is not to say that one won't get voltage depression,
but rather that one won't destroy the cell(s).

http://www.repairfaq.org/ELE/F_NiCd_Battery.html#NICDBATTERY_002

RogerN


And more:

What about trickle charging? As mentioned in Part 1, trickling is not
really necessary for NiCd's, since the C/10 rate is OK for virtually
indefinite charging without fear of overcharging. However, some
chargers on the market do offer an automatic switch-over to trickle
charging after completing the fast or overnight charge. A trickle
charge is technically the C/20 rate or lower, i.e., the current
number obtained by halving the C/10 overnight rate.
http://www.electrodynam.com/rc/totm/totm1100.shtml
NiCd and NiMH cells have the advantage that they can be charged and
discharged rapidly. They are poor at slow rate discharges. NiCd cells
became popular because they can be charged gently indefinitely
without gassing. A typical charging arrangement is to charge the
cells for 1.4 times their capacity. A 1 Ah cell would normally be
charged at 100mA for 14 hours but could be charged for 20 hours or
more at 100mA without damaging the cell.
http://homepage.ntlworld.com/wilf.james/nicads.htm
Slow charge rates (between 0.05 C and 0.1 C) are the most-often
recommended charge rate, since a battery can be recharged in less
than a day, without significant probability of damaging or degrading
the battery. Slow charge rates can be applied to a battery for an
indefinite period of time, meaning that the battery can be connected
to the charger for days or weeks with no need for special shut-off or
current-limiting equipment on the charger.
http://www.ncjrs.gov/txtfiles/172868.txtIndefinite constant current
charging acceptable at 10%
capacityhttp://www.trainweb.org/girr/tips/tips7/battery_rc_tips.htmlNickel-Cadmium:
NiCd batteries are charged with aconstant-current profile. NiCd
batteries can be continu-ously charged at the standard C/10 trickle
rate indefi-nitely without excessive temperature rise or
damageNickel-Cadmium: NiCd batteries are charged with
aconstant-current profile. NiCd batteries can be continu-ously
charged at the standard C/10 trickle rate indefi-nitely without
excessive temperature rise or damageconstant-current profile. NiCd
batteries can be continu-ously charged at the standard C/10 trickle
rate indefi-nitely without excessive temperature rise or
damagebatteries can be continu-ously charged at the standard C/10
trickle rate indefi-nitely without excessive temperatureRogerN

Thanks for the follow-ups. I've visited the links you provided and those
guys seem to know what they are talking about. Even if their information is
not 100% accurate, they give a good overview of the issues involved.

 

[Phil Allison]

"pimpom"

Thanks for the follow-ups. I've visited the links you provided and those
guys seem to know what they are talking about.

** No way for you to conclude that unless YOU are a expert yourself.

It is easy to find links that COMPLETELY contradict the ones given.

Google " NiCd trickle charge dendrites " for some sobering info.

Even if their information is not 100% accurate, they give a good overview
of the issues involved.

** No way for you to conclude that unless YOU are a expert yourself.

Which of course you ain't.


....... Phil

 

[Don Klipstein]

In article <gubvqk$9ib$1@news.albasani.net>, pimpom wrote:

RogerN wrote:
"RogerN" <regor@midwest.net> wrote in message
news:W-2dnRH7Q6Sbe5XXnZ2dnUVZ_v2dnZ2d@earthlink.com...

"pimpom" <pimpom@invalid.invalid> wrote in message
news:gu7991$3or$1@news.albasani.net...
snip
Hmmm. It looks as if there's no definitive answer. Would you say
that something like C/20 would be a reasonable compromise?

Here's some info:

2.13) So, what's the right charge current?
Depends. If using an unregulated charger -- one that doesn't do any
detection of full charge, then one must restrict your charge current
to the overcharge capacity of your cell. All NiCd cells I have seen
can handle C/10 (approx. 50 mA for AA cell) indefinitely without
venting. This is not to say that one won't get voltage depression,
but rather that one won't destroy the cell(s).

http://www.repairfaq.org/ELE/F_NiCd_Battery.html#NICDBATTERY_002

RogerN


And more:

What about trickle charging? As mentioned in Part 1, trickling is not
really necessary for NiCd's, since the C/10 rate is OK for virtually
indefinite charging without fear of overcharging. However, some
chargers on the market do offer an automatic switch-over to trickle
charging after completing the fast or overnight charge. A trickle
charge is technically the C/20 rate or lower, i.e., the current
number obtained by halving the C/10 overnight rate.
http://www.electrodynam.com/rc/totm/totm1100.shtml
NiCd and NiMH cells have the advantage that they can be charged and
discharged rapidly. They are poor at slow rate discharges. NiCd cells
became popular because they can be charged gently indefinitely
without gassing. A typical charging arrangement is to charge the
cells for 1.4 times their capacity. A 1 Ah cell would normally be
charged at 100mA for 14 hours but could be charged for 20 hours or
more at 100mA without damaging the cell.
http://homepage.ntlworld.com/wilf.james/nicads.htm
Slow charge rates (between 0.05 C and 0.1 C) are the most-often
recommended charge rate, since a battery can be recharged in less
than a day, without significant probability of damaging or degrading
the battery. Slow charge rates can be applied to a battery for an
indefinite period of time, meaning that the battery can be connected
to the charger for days or weeks with no need for special shut-off or
current-limiting equipment on the charger.
http://www.ncjrs.gov/txtfiles/172868.txtIndefinite constant current
charging acceptable at 10%
capacityhttp://www.trainweb.org/girr/tips/tips7/battery_rc_tips.htmlNickel-Cadmium:
NiCd batteries are charged with aconstant-current profile. NiCd
batteries can be continu-ously charged at the standard C/10 trickle
rate indefi-nitely without excessive temperature rise or
damageNickel-Cadmium: NiCd batteries are charged with
aconstant-current profile. NiCd batteries can be continu-ously
charged at the standard C/10 trickle rate indefi-nitely without
excessive temperature rise or damageconstant-current profile. NiCd
batteries can be continu-ously charged at the standard C/10 trickle
rate indefi-nitely without excessive temperature rise or
damagebatteries can be continu-ously charged at the standard C/10
trickle rate indefi-nitely without excessive temperatureRogerN

Thanks for the follow-ups. I've visited the links you provided and those
guys seem to know what they are talking about. Even if their information is
not 100% accurate, they give a good overview of the issues involved.

I would check into dendrites. Overcharging of NiCd cells, especially
long term constant trickle charging, contributes to those. Once a
dendrite punctures the separator, the cell has a foot in the grave.

It comes down to what amount of trickle charging while fully charged
does not cause enough dendrite growth to make cells die too much earlier
than they would be declared dead for some other reason.

Another thing - charging when already fully charged makes the cells
warmer and that makes them age faster. My experience so far is that C/10
warms cells a little noticeably, and that C/4 warms cells enough for
reasonably reliable detection of full charge via either direct detection
of warming (temperature sensor) or indirect detection of warming (voltage
decreases after increasing).
It appears to me that C/20 *usually* does not warm cells enough after
they are fully charged to accelerate their aging much, though I would
worry about the dendrite issue if the cells are cooking 24/7/365 at C/20.

Should you find it practical to reliably detect full charge and then
switch to a lower "trickle charge" current, such as with usage of one of
those "smart charger" ICs that detects reversal of increasing voltage that
results from C/4 or faster charge causing cells to heat up after achieving
"completion of charging", it appears to me good to have such a "smart
charger" reduce the charging current to something close to or slightly
outpacing self-discharge of "topped-off" cells.
I suspect that C/100 and C/200 will work well, C/200 may keep cells only
80-90% "full", though I also suspect that C/50 may be, maybe "usually is",
"not that big a deal" for NiCd cells being cooked at such rate 24/7/365.

NiMH appears to me to have less tolerance than NiCd for trickle charging
24/7/365 at rate exceeding self-discharge that occurs at "full charge".
Not that I ventured major testing efforts, but some NiMH cell datasheets
and some web-search-able items along those lines makes it appear to me
that a NiMH cell has ususlly zero to sometimes very minimal,
likely-well-tolerated overcharging when trickle-charged at C/200 while
fully charged. (NiCd appears to me to "usually not die much earlier than
life expectancy" if trickle-charged 24/7/365 at C/100, fair-to-good-chance
at C/50, some-to-fair chance even at C/20.)

- Don Klipstein (don@misty.com)

 

[Phil Allison]

<ggherold@gmail.com>


Thanks for that Don, I was buying a pair of RC battery powered cars
for my son and I a few years ago and after a bit of research concluded
that NiCd's were more robust and less susceptable to abuse than the
NiMH. Even though the NiMH were lighter and held more charge, I
bought the NiCd's.

** Fool.


I also read that the NiMH only store about 70% of
the charge that is pumped through them. Whereas the NiCd's keep 90 to
95% of the charge. I wonder if anyone has tested this?


** Even if true ( and it is not) how would it matter ??


...... Phil

 

[Phil Allison]

<ggherold@gmail.com
"Phil Allison"

Thanks for that Don, I was buying a pair of RC battery powered cars
for my son and I a few years ago and after a bit of research concluded
that NiCd's were more robust and less susceptable to abuse than the
NiMH. Even though the NiMH were lighter and held more charge, I
bought the NiCd's.

** Fool.

I also read that the NiMH only store about 70% of
the charge that is pumped through them. Whereas the NiCd's keep 90 to
95% of the charge. I wonder if anyone has tested this?

** Even if true ( and it is not) how would it matter ??

** Fool.

Why? Cost per A-hr was less for NiCds.

** Barely - and having more AH is the important thing.


Also thought my 9 year old
son could leave them plugged in for a day with out destroying them.


** Same goes for NiMH - god knows what crap you have been reading.

** Even if true ( and it is not) how would it matter ??

Oh, have you measured this? It certainly makes no difference for an
RC car powered from my wall socket,


** Which was the only point at issue.




..... Phil

 

On May 12, 8:19 pm, d...@manx.misty.com (Don Klipstein) wrote:

In article <gubvqk$9i...@news.albasani.net>, pimpom wrote:
RogerN wrote:
"RogerN" <re...@midwest.net> wrote in message
news:W-2dnRH7Q6Sbe5XXnZ2dnUVZ_v2dnZ2d@earthlink.com...

"pimpom" <pim...@invalid.invalid> wrote in message
news:gu7991$3or$1@news.albasani.net...
snip
Hmmm. It looks as if there's no definitive answer. Would you say
that something like C/20 would be a reasonable compromise?

Here's some info:

2.13) So, what's the right charge current?
Depends. If using an unregulated charger -- one that doesn't do any
detection of full charge, then one must restrict your charge current
to the overcharge capacity of your cell. All NiCd cells I have seen
can handle C/10 (approx. 50 mA for AA cell) indefinitely without
venting. This is not to say that one won't get voltage depression,
but rather that one won't destroy the cell(s).

http://www.repairfaq.org/ELE/F_NiCd_Battery.html#NICDBATTERY_002

RogerN

And more:

What about trickle charging? As mentioned in Part 1, trickling is not
really necessary for NiCd's, since the C/10 rate is OK for virtually
indefinite charging without fear of overcharging. However, some
chargers on the market do offer an automatic switch-over to trickle
charging after completing the fast or overnight charge. A trickle
charge is technically the C/20 rate or lower, i.e., the current
number obtained by halving the C/10 overnight rate.
http://www.electrodynam.com/rc/totm/totm1100.shtml
NiCd and NiMH cells have the advantage that they can be charged and
discharged rapidly. They are poor at slow rate discharges. NiCd cells
became popular because they can be charged gently indefinitely
without gassing. A typical charging arrangement is to charge the
cells for 1.4 times their capacity. A 1 Ah cell would normally be
charged at 100mA for 14 hours but could be charged for 20 hours or
more at 100mA without damaging the cell.
http://homepage.ntlworld.com/wilf.james/nicads.htm
Slow charge rates (between 0.05 C and 0.1 C) are the most-often
recommended charge rate, since a battery can be recharged in less
than a day, without significant probability of damaging or degrading
the battery. Slow charge rates can be applied to a battery for an
indefinite period of time, meaning that the battery can be connected
to the charger for days or weeks with no need for special shut-off or
current-limiting equipment on the charger.
http://www.ncjrs.gov/txtfiles/172868.txtIndefiniteconstant current
charging acceptable at 10%
capacityhttp://www.trainweb.org/girr/tips/tips7/battery_rc_tips.htmlNickel-Ca...
NiCd batteries are charged with aconstant-current profile. NiCd
batteries can be continu-ously charged at the standard C/10 trickle
rate indefi-nitely without excessive temperature rise or
damageNickel-Cadmium: NiCd batteries are charged with
aconstant-current profile. NiCd batteries can be continu-ously
charged at the standard C/10 trickle rate indefi-nitely without
excessive temperature rise or damageconstant-current profile. NiCd
batteries can be continu-ously charged at the standard C/10 trickle
rate indefi-nitely without excessive temperature rise or
damagebatteries can be continu-ously charged at the standard C/10
trickle rate indefi-nitely without excessive temperatureRogerN

Thanks for the follow-ups. I've visited the links you provided and those
guys seem to know what they are talking about. Even if their information is
not 100% accurate, they give a good overview of the issues involved.

  I would check into dendrites.  Overcharging of NiCd cells, especially
long term constant trickle charging, contributes to those.  Once a
dendrite punctures the separator, the cell has a foot in the grave.

  It comes down to what amount of trickle charging while fully charged
does not cause enough dendrite growth to make cells die too much earlier
than they would be declared dead for some other reason.

  Another thing - charging when already fully charged makes the cells
warmer and that makes them age faster.  My experience so far is that C/10
warms cells a little noticeably, and that C/4 warms cells enough for
reasonably reliable detection of full charge via either direct detection
of warming (temperature sensor) or indirect detection of warming (voltage
decreases after increasing).
  It appears to me that C/20 *usually* does not warm cells enough after
they are fully charged to accelerate their aging much, though I would
worry about the dendrite issue if the cells are cooking 24/7/365 at C/20.

  Should you find it practical to reliably detect full charge and then
switch to a lower "trickle charge" current, such as with usage of one of
those "smart charger" ICs that detects reversal of increasing voltage that
results from C/4 or faster charge causing cells to heat up after achieving
"completion of charging", it appears to me good to have such a "smart
charger" reduce the charging current to something close to or slightly
outpacing self-discharge of "topped-off" cells.
  I suspect that C/100 and C/200 will work well, C/200 may keep cells only
80-90% "full", though I also suspect that C/50 may be, maybe "usually is",
"not that big a deal" for NiCd cells being cooked at such rate 24/7/365.

  NiMH appears to me to have less tolerance than NiCd for trickle charging
24/7/365 at rate exceeding self-discharge that occurs at "full charge".
  Not that I ventured major testing efforts, but some NiMH cell datasheets
and some web-search-able items along those lines makes it appear to me
that a NiMH cell has ususlly zero to sometimes very minimal,
likely-well-tolerated overcharging when trickle-charged at C/200 while
fully charged.  (NiCd appears to me to "usually not die much earlier than
life expectancy" if trickle-charged 24/7/365 at C/100, fair-to-good-chance
at C/50, some-to-fair chance even at C/20.)

 - Don Klipstein (d...@misty.com)- Hide quoted text -

- Show quoted text -

Thanks for that Don, I was buying a pair of RC battery powered cars
for my son and I a few years ago and after a bit of research concluded
that NiCd's were more robust and less susceptable to abuse than the
NiMH. Even though the NiMH were lighter and held more charge, I
bought the NiCd's. I also read that the NiMH only store about 70% of
the charge that is pumped through them. Whereas the NiCd's keep 90 to
95% of the charge. I wonder if anyone has tested this?

George Herold

 

On May 12, 10:41 pm, "Phil Allison" <philalli...@tpg.com.au> wrote:

ggher...@gmail.com

Thanks for that Don,  I was buying a pair of RC battery powered cars
for my son and I a few years ago and after a bit of research concluded
that NiCd's were more robust and less susceptable to abuse than the
NiMH.  Even though the NiMH were lighter and held more charge, I
bought the NiCd's.

**  Fool.

I also read that the NiMH only store about 70% of
the charge that is pumped through them.  Whereas the NiCd's keep 90 to
95% of the charge.   I wonder if anyone has tested this?

** Even if true ( and it is not)  how would it matter ??

.....   Phil

** Fool.
Why? Cost per A-hr was less for NiCds. Also thought my 9 year old

son could leave them plugged in for a day with out destroying them.

** Even if true ( and it is not) how would it matter ??

Oh, have you measured this? It certainly makes no difference for an
RC car powered from my wall socket, but I heard that Hybrid cars also
use NiMH, If so that's certainly a factor in all the efficiency
talk.

 

[RogerN]

"pimpom" <pimpom@invalid.invalid> wrote in message
news:gubvqk$9ib$1@news.albasani.net...
<snip>

Thanks for the follow-ups. I've visited the links you provided and those
guys seem to know what they are talking about. Even if their information
is not 100% accurate, they give a good overview of the issues involved.

How about something like this:

http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1037,C1078,C1088,P7601


RogerN

 

On May 12, 11:38 pm, "Phil Allison" <philalli...@tpg.com.au> wrote:

ggher...@gmail.com
 "Phil Allison"





Thanks for that Don, I was buying a pair of RC battery powered cars
for my son and I a few years ago and after a bit of research concluded
that NiCd's were more robust and less susceptable to abuse than the
NiMH. Even though the NiMH were lighter and held more charge, I
bought the NiCd's.

** Fool.

I also read that the NiMH only store about 70% of
the charge that is pumped through them. Whereas the NiCd's keep 90 to
95% of the charge. I wonder if anyone has tested this?

** Even if true ( and it is not) how would it matter ??

**  Fool.

Why?  Cost per A-hr was less for NiCds.

**  Barely -  and having more AH is the important thing.

 Also thought my 9 year old
son could leave them plugged in for a day with out destroying them.

** Same goes for NiMH   -  god knows what crap you have been reading.

** Even if true ( and it is not)  how would it matter ??

Oh, have you measured this?  It certainly makes no difference for an
RC car powered from my wall socket,

**  Which was the only point at issue.

....  Phil- Hide quoted text -

- Show quoted text -

"> ** Same goes for NiMH - god knows what crap you have been
reading."

Hmm I have no idea either. I was more than a year ago and I'm lucky
if I can remember what I was doing last week. I also recall that the
NiMH's were more easily damaged by overheating. So you had to let
them cool off more before recharging and also charge them slower. For
RC car racing I bought three 1.5 A-hr NiCd's for the price of one 4.0
A-hr NiMH... and by cycling them, one in car, one cooling off and one
recharging, we could race cars all day.

Ignoring the RC car racing issue. Do you have any data or information
on the charging effeiciency of NiCds vs NiMH? Perhaps if you charge
the NiMH slowly they do a better job of hanging on to all the
electrons?

George Herold