Ni-Cad battery advice

[WbSearch]

Just bought some new D Ni-Cad's and one is at 0 volts, others about 1.088. The
supplier suggests a quick charge on the dead one becasue it is in a "sleep
mode". My understanding is Ni-Cads should never go to 0, unless totally
discharged by a load, and that's not a good idea either. Is the battery OK to
charge and use? Thanks in advance.

 

[Harry Bloomfield]

In article <20030826092402.29705.00000333@mb-m21.aol.com>,
wbsearch@aol.com says...
| Just bought some new D Ni-Cad's and one is at 0 volts, others about 1.088. The
| supplier suggests a quick charge on the dead one becasue it is in a "sleep
| mode". My understanding is Ni-Cads should never go to 0, unless totally
| discharged by a load, and that's not a good idea either. Is the battery OK to
| charge and use?
|

Possibly, try charging it.

I have never heard of a 'sleep mode', it is either very discharged or
perhaps internally shorted.
--
Regards,
Harry (M1BYT)...

Remove the 'NOSPAM' in my email address to reply.

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[Jerry G.]

Tell him to exchange the battery, because it is dead, and you cannot
recover it. Also, once these are dead like this, they never really get
back to normal.

--

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Jerry Greenberg GLG Technologies GLG
==============================================
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==============================================
"WbSearch" <wbsearch@aol.com> wrote in message
news:20030826092402.29705.00000333@mb-m21.aol.com...
Just bought some new D Ni-Cad's and one is at 0 volts, others about
1.088. The
supplier suggests a quick charge on the dead one becasue it is in a
"sleep
mode". My understanding is Ni-Cads should never go to 0, unless totally
discharged by a load, and that's not a good idea either. Is the battery
OK to
charge and use? Thanks in advance.

 

[mike]

WbSearch wrote:

Just bought some new D Ni-Cad's and one is at 0 volts, others about 1.088. The
supplier suggests a quick charge on the dead one becasue it is in a "sleep
mode". My understanding is Ni-Cads should never go to 0, unless totally
discharged by a load, and that's not a good idea either. Is the battery OK to
charge and use? Thanks in advance.

A NiCd at zero volts is not necessarily bad, but one that is NOT at zero
is more likely to be good. The only reason for a NiCd to be at zero is
cause it has internal leakage "excessive self discharge", or has been
stored for a very long time. Neither is to your benefit.
I'd send it back, not worth the risk. After you mess around with it for
a month and decide it's leaky, it's too late.
mike
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Tek 2465 $800, ham radio, 30pS pulser
Tektronix Concept Books, spot welding head...
http://www.geocities.com/SiliconValley/Monitor/4710/

 

[WbSearch]

Thanks for the reply. I spoke to the salesman at Mega Batteries and he is
sending a replacement, no hassle at all.

 

[Dave D]

"WbSearch" <wbsearch@aol.com> wrote in message
news:20030826092402.29705.00000333@mb-m21.aol.com...

Just bought some new D Ni-Cad's and one is at 0 volts, others about 1.088.
The
supplier suggests a quick charge on the dead one becasue it is in a "sleep
mode".

That sounds like rip-off merchant speak for 'this cell is knackered,
cher-ching'

My understanding is Ni-Cads should never go to 0, unless totally

discharged by a load, and that's not a good idea either. Is the battery
OK to
charge and use? Thanks in advance.

Take it back and get a replacement, some chargers will refuse to charge a 0v
cell as it will appear as a dead short. You may be able to stuff some
current through it from a bench psu to get it going prior to charging, but
why should you have to?

Dave