OT - Litrhium versus Ni Cad
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Posts: 46,084
Gentlemen:
I know this is OT but I thought I would ask.
I recently purchase a magnetometer. It uses a soldered in place
Lithium battery (3.5 vdc) to keep the internal Julian clock active when
not being powered. I wish to replace the dead battery with a Ni-Cad
(3.6vdc) that I can quickly replace when it is expired. This modification
will save me from disassembling the unit just to replace the battery.
The manufacturer of the magnetometer claims that the Lithium battery
(an AA size) should be replaced every 6 to 10 years.
Does anyone have any suggestions on why I shouldn't make this
conversion? I know the voltages are different. Should that make
any difference?
Thank you for your replies.
Dick
KF4DSL
[noparse][[/noparse]Non-text portions of this message have been removed]
I know this is OT but I thought I would ask.
I recently purchase a magnetometer. It uses a soldered in place
Lithium battery (3.5 vdc) to keep the internal Julian clock active when
not being powered. I wish to replace the dead battery with a Ni-Cad
(3.6vdc) that I can quickly replace when it is expired. This modification
will save me from disassembling the unit just to replace the battery.
The manufacturer of the magnetometer claims that the Lithium battery
(an AA size) should be replaced every 6 to 10 years.
Does anyone have any suggestions on why I shouldn't make this
conversion? I know the voltages are different. Should that make
any difference?
Thank you for your replies.
Dick
KF4DSL
[noparse][[/noparse]Non-text portions of this message have been removed]
Comments
must be low.
As I understand, NiCads can source a greater level of current. Lithiums have a
high
capacity is the current draw is small.
Since the actual voltage of a battery can be be above above nomimal, it would
seem
that your magnetometer should be able to deal with a slightly higher voltage.
Paul
> Gentlemen:
>
> I know this is OT but I thought I would ask.
>
> I recently purchase a magnetometer. It uses a soldered in place
> Lithium battery (3.5 vdc) to keep the internal Julian clock active when
> not being powered. I wish to replace the dead battery with a Ni-Cad
> (3.6vdc) that I can quickly replace when it is expired. This modification
> will save me from disassembling the unit just to replace the battery.
> The manufacturer of the magnetometer claims that the Lithium battery
> (an AA size) should be replaced every 6 to 10 years.
>
> Does anyone have any suggestions on why I shouldn't make this
> conversion? I know the voltages are different. Should that make
> any difference?
>
> Thank you for your replies.
>
> Dick
> KF4DSL
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
>
> To UNSUBSCRIBE, just send mail to:
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> from the same email address that you subscribed. Text in the Subject and Body
of the message will be ignored.
>
> Yahoo! Groups Links
>
>
>
>
>
NiCad's self-discharge themselves. You can't
really expect a NiCad charge to last more than
3 months, unless you have some kind of charging
circuit on it.
Since the original circuit was designed for
a Lithium cell, it is very safe to assume there
is no charging circuit -- so you'll have to
replace the NiCad every 3 months with a fully
charged NiCad.
It makes LOTS more sense to replace the Lithium
with the appropriate Lithium, and then wait
another 6 to 12 years.
--- In basicstamps@yahoogroups.com, <verhap@o...> wrote:
> Is there a current concern? If the li will last 6 years, I imagine
the draw must be low.
> As I understand, NiCads can source a greater level of current.
Lithiums have a high
> capacity is the current draw is small.
>
> Since the actual voltage of a battery can be be above above
nomimal, it would seem
> that your magnetometer should be able to deal with a slightly
higher voltage.
>
> Paul
>
> > Gentlemen:
> >
> > I know this is OT but I thought I would ask.
> >
> > I recently purchase a magnetometer. It uses a soldered in place
> > Lithium battery (3.5 vdc) to keep the internal Julian clock
active when
> > not being powered. I wish to replace the dead battery with a Ni-
Cad
> > (3.6vdc) that I can quickly replace when it is expired. This
modification
> > will save me from disassembling the unit just to replace the
battery.
> > The manufacturer of the magnetometer claims that the Lithium
battery
> > (an AA size) should be replaced every 6 to 10 years.
> >
> > Does anyone have any suggestions on why I shouldn't make this
> > conversion? I know the voltages are different. Should that make
> > any difference?
> >
> > Thank you for your replies.
> >
> > Dick
> > KF4DSL
> >
> >
> > [noparse][[/noparse]Non-text portions of this message have been removed]
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the
Subject and Body of the message will be ignored.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
Thank you gentlemen for your replies.
I took Mr. Lanes' advice and went back to RS to check for additional Lithium
batteries and I located a 3.6vdc size AA. I also purchase a single AA sized
battery holder and installed it in my magnetometer it works fine.
Thanks again. This is a great group. I've been here for 4 years.
Dick
KF4DSL
Original Message
From: Allan Lane <allan.lane@h...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, February 27, 2004 11:53 AM
Subject: [noparse][[/noparse]basicstamps] Re: OT - Litrhium versus Ni Cad
> Yes, there is a very good reason NOT to do this.
> NiCad's self-discharge themselves. You can't
> really expect a NiCad charge to last more than
> 3 months, unless you have some kind of charging
> circuit on it.
>
> Since the original circuit was designed for
> a Lithium cell, it is very safe to assume there
> is no charging circuit -- so you'll have to
> replace the NiCad every 3 months with a fully
> charged NiCad.
>
> It makes LOTS more sense to replace the Lithium
> with the appropriate Lithium, and then wait
> another 6 to 12 years.
>
> --- In basicstamps@yahoogroups.com, <verhap@o...> wrote:
> > Is there a current concern? If the li will last 6 years, I imagine
> the draw must be low.
> > As I understand, NiCads can source a greater level of current.
> Lithiums have a high
> > capacity is the current draw is small.
> >
> > Since the actual voltage of a battery can be be above above
> nomimal, it would seem
> > that your magnetometer should be able to deal with a slightly
> higher voltage.
> >
> > Paul
> >
> > > Gentlemen:
> > >
> > > I know this is OT but I thought I would ask.
> > >
> > > I recently purchase a magnetometer. It uses a soldered in place
> > > Lithium battery (3.5 vdc) to keep the internal Julian clock
> active when
> > > not being powered. I wish to replace the dead battery with a Ni-
> Cad
> > > (3.6vdc) that I can quickly replace when it is expired. This
> modification
> > > will save me from disassembling the unit just to replace the
> battery.
> > > The manufacturer of the magnetometer claims that the Lithium
> battery
> > > (an AA size) should be replaced every 6 to 10 years.
> > >
> > > Does anyone have any suggestions on why I shouldn't make this
> > > conversion? I know the voltages are different. Should that make
> > > any difference?
> > >
> > > Thank you for your replies.
> > >
> > > Dick
> > > KF4DSL
> > >
> > >
> > > [noparse][[/noparse]Non-text portions of this message have been removed]
> > >
> > >
> > >
> > > To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@yahoogroups.com
> > > from the same email address that you subscribed. Text in the
> Subject and Body of the message will be ignored.
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
> Yahoo! Groups Links
>
>
>
>
>