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're [EE] Counterfeit Sony NimH batteries ???'
2004\10\26@010943 by Russell McMahon

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They are quick enough at least:

{Quote hidden}

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2004\10\26@012836 by Spehro Pefhany

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At 06:09 PM 10/26/2004 +1300, you wrote:
>They are quick enough at least:

<snip>

Perhaps interesting in what it omits. Nothing about confirming the fault with
the manufacturer. ;-)

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
spam_OUTspeffTakeThisOuTspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com




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2004\10\26@035418 by hael Rigby-Jones

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>-----Original Message-----
>From: .....piclist-bouncesKILLspamspam@spam@MIT.EDU [piclist-bouncesspamKILLspamMIT.EDU]
>On Behalf Of Russell McMahon
>Sent: 26 October 2004 06:10
>To: PIC List
>Subject: re [EE] Counterfeit Sony NimH batteries ???
>
>
>They are quick enough at least:
>
>>> Has anyone else reported problems with these batteries?
>>> What should I do?
>
>> We are sorry to hear you are having trouble with the product you
>> purchased from us.

Are you going to mention the possibility of counterfeit goods to them?  It
seems to have enough evidence purely in terms of the weight of the cells
coupled with their low capacity.

Regards

Mike

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2004\10\26@060317 by Russell McMahon

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> Are you going to mention the possibility of counterfeit goods to them?  It
> seems to have enough evidence purely in terms of the weight of the cells
> coupled with their low capacity.

After I measure the actual mAh capacity. Which I'm about to go and build the
measurer for, having just got home from a  meeting.

A consideration is the appropriate discharge rate.

Camera must draw an amazing load overall as 2000 mAH is good for about 500
shots or maybe 1000 being very very careful on how long the camera is on. I
can take 1000 shots in an hour (that's rather pushing things :-) ) - say 2
hours or 1A average under heavy shoot and save conditions. !
That will reduce the mAh somewhat. I'll probably go for either a 4 hour rate
or, as the first run will be overnight, why not a slower rate to be done by
about morning and give a higher effective rate due to lower drain.


       RM


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2004\10\26@212504 by R. Burrage

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Russell,

You might want to do a little research into how these batteries are
specified in respect to discharge capacity.  Most of my work has been
with lead-acid rechargeable batteries and they are specified at a 20
hour rate, i.e. a 20Ah battery is capable of providing 1 amp to a load
for 20 hours until 100% dod.  The battery may provide a bit more
operating time with a lower discharge rate but the operating time is
definitely less with a higher discharge rate.

I'm not so sure about NiMH batteries, but I seem to remember something
about a C/10 discharge rate (essentially a 10 hour rate) for this
chemistry as well as NiCd.  Dave Van Horn worked with these for a
project several years ago (we are both from the dark side...AVRs) and
may be able to provide further information.  Have you checked his web pages?

REB

Russell McMahon wrote:

{Quote hidden}

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2004\10\26@221322 by Dave VanHorn

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At 09:24 PM 10/26/2004 -0400, R. Burrage wrote:
>Russell,
>
>You might want to do a little research into how these batteries are
>specified in respect to discharge capacity.  Most of my work has been with
>lead-acid rechargeable batteries and they are specified at a 20 hour rate,
>i.e. a 20Ah battery is capable of providing 1 amp to a load for 20 hours
>until 100% dod.  The battery may provide a bit more operating time with a
>lower discharge rate but the operating time is definitely less with a
>higher discharge rate.
>
>I'm not so sure about NiMH batteries, but I seem to remember something
>about a C/10 discharge rate (essentially a 10 hour rate) for this
>chemistry as well as NiCd.  Dave Van Horn worked with these for a project
>several years ago (we are both from the dark side...AVRs) and may be able
>to provide further information.  Have you checked his web pages?

With recent NIMH cells, you should get about 1C performance at 1C
discharge, but the specs on the cells should tell if there's a significant
limit on discharge rate.

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