NiCad Cells for UK D8R Battery Pack

Batteries in the standard D8R battery pack are 4000 mAh sanyo Nicads.

A mate has a tired pack, so we are looking to replace the cells with
these 5500 mAh cells http://tinyurl.com/5q8tk

Q1. Will the standard charger charge these larger capacity cells
without problem (though obviously over a pro rata longer charging
period)?

Q2. Does anyone know of a significantly better deal on 5500mAh (or
bigger) tagged D cells than the £43 odd that Maplins will want for 8
off? Availability and delivery is an issue as the pack needs to be
ready for the weekend.

Thanks

David

On Mon, 23 Aug 2004 10:01:42 +0100, rads
<radsxxunspamxx@davidradley.freeserve.co.uk> wrote:


>Q1. Will the standard charger charge these larger capacity cells
>without problem (though obviously over a pro rata longer charging
>period)?
>
I guess so, the same charger does my 1800 and 2300 AA's as you say, it
takes a bit longer.

>Q2. Does anyone know of a significantly better deal on 5500mAh (or
>bigger) tagged D cells than the £43 odd that Maplins will want for 8
>off? Availability and delivery is an issue as the pack needs to be
>ready for the weekend.

I got some 9000MAH size D from a place in Broughton Astley, over the
counter: specialist battery warehouse. If you're heading for Stoney
Stanton it's only 3 miles away. Don't know if that helps?

>>I got some 9000MAH size D
>
> (*?!!!** WTF ???? 9000mAh
> Checks.
> NIMH, not NICD!

They'd be no problem in the torch, just the charger that might not like
them - but then its maybe worth getting a different charger to do the NiMH
anyway if you use the torch a lot?

David

On Mon, 23 Aug 2004 17:10:30 +0100, "David Walker"
<wbsdavenews@hotmail.com> wrote:

>>>I got some 9000MAH size D
>>
>> (*?!!!** WTF ???? 9000mAh
>> Checks.
>> NIMH, not NICD!
>
>They'd be no problem in the torch, just the charger that might not like
>them - but then its maybe worth getting a different charger to do the NiMH
>anyway if you use the torch a lot?
>
>David
>
The idea was to get a mates torch running again, without spending the
approx £90 some LDSs want for a new genuine UK battery pack.

He has recently replaced the charger, so will probably not want the
extra expense of a set of NIMH and associated charger. The 5500s from
Maplin should be a useful enough upgrade over the original 4000s.

Thanks

David

rads wrote:
> On Mon, 23 Aug 2004 17:10:30 +0100, "David Walker"
> <wbsdavenews@hotmail.com> wrote:
>
>>>> I got some 9000MAH size D
>>>
>>> (*?!!!** WTF ???? 9000mAh
>>> Checks.
>>> NIMH, not NICD!
>>
>> They'd be no problem in the torch, just the charger that might not
>> like them - but then its maybe worth getting a different charger to
>> do the NiMH anyway if you use the torch a lot?
>>
>> David
>>
> The idea was to get a mates torch running again, without spending the
> approx £90 some LDSs want for a new genuine UK battery pack.
>
> He has recently replaced the charger, so will probably not want the
> extra expense of a set of NIMH and associated charger. The 5500s from
> Maplin should be a useful enough upgrade over the original 4000s.
>
> Thanks
>
> David

I've just bought 4 x 4500mAh to replace the pack in my UK C4R. Ordered
Saturday, delivered Monday morning.

Tagged D 9000mAh are on offer at £6.50 each. Charging those with the
standard charger may be an epic event!

http://www.powerstoredirect.co.uk/x2200.html

HTH

Paul

"rads" <radsxxunspamxx@davidradley.freeserve.co.uk> wrote in message
news:nfbji0pofa5ursc5kuo0m17g4otk5ahqp6@4ax.com...
> Batteries in the standard D8R battery pack are 4000 mAh sanyo Nicads.
>
> A mate has a tired pack, so we are looking to replace the cells with
> these 5500 mAh cells http://tinyurl.com/5q8tk
>
> Q1. Will the standard charger charge these larger capacity cells
> without problem (though obviously over a pro rata longer charging
> period)?
>
> Q2. Does anyone know of a significantly better deal on 5500mAh (or
> bigger) tagged D cells than the £43 odd that Maplins will want for 8
> off? Availability and delivery is an issue as the pack needs to be
> ready for the weekend.
>
> Thanks
>
> David
>

I'm not sure why anyone would use nicads these days when Ni-Mh are so much better?
I've thrown my Nicads out long time ago.

Adam

On Tue, 24 Aug 2004 00:42:27 GMT, "Adam Helberg"
<sendspamhere@yahoo.com> wrote:

>
>I'm not sure why anyone would use nicads these days when Ni-Mh are so much better?
>I've thrown my Nicads out long time ago.
>
>Adam
>
Is it possible to use the same charger for NiMH as NiCad? I had
thought the NiMH demanded something a standard cheapy NiCad charger
would not supply, thus stuck with the existing battery technology.

David

rads wrote:

> Is it possible to use the same charger for NiMH as NiCad? I had
> thought the NiMH demanded something a standard cheapy NiCad charger
> would not supply, thus stuck with the existing battery technology.

AIUI (and I may be wrong) a *standard* NiCad charger will charge Li-MH
just fine, the problem is with the 'fast' or 'rapid' NiCad chargers.
Apparently Li-MH need to be trickle charged and can't cope with the
aggressive quick-charge that NiCad can. Hope that makes sense. My
9000MAh D's need 14 hours at 900MA.
hth

rads <radsxxunspamxx@davidradley.freeserve.co.uk> wrote in message news:<qotli0t47dems1ekngt3l1v5u2bsu0a3s6@4ax.com>. ..
> On Tue, 24 Aug 2004 00:42:27 GMT, "Adam Helberg"
> <sendspamhere@yahoo.com> wrote:
>
> >
> >I'm not sure why anyone would use nicads these days when Ni-Mh are so much better?
> >I've thrown my Nicads out long time ago.
> >
> >Adam
> >
> Is it possible to use the same charger for NiMH as NiCad? I had
> thought the NiMH demanded something a standard cheapy NiCad charger
> would not supply, thus stuck with the existing battery technology.
>
> David

NiCad and NiMH need pretty much identical charging regimes so you can
use the same charger. Lead Acid has totally different requirements

NiCad are still popular in power tools. They are more robust tham
NiMH and can take a lot more abusive use. Also NiCads last around
1000 full cycles but NiMH last around 500. Pays your money etc..

Nick

nickjb wrote:
>
> NiCad and NiMH need pretty much identical charging regimes so you can
> use the same charger. Lead Acid has totally different requirements

Typically yes, but not quite. Please see for instance:

http://www.greenbatteries.com/docume...harger_FAQ.htm

> NiCad are still popular in power tools. They are more robust tham
> NiMH and can take a lot more abusive use. Also NiCads last around
> 1000 full cycles but NiMH last around 500. Pays your money etc..

AFAIK, the main real difference is the discharge current capacity.
NiCd can take larger discharge currents, hence are more applicable to
powertools where you need as much ompf as possible.

BTW, I just upgraded my Omersub Technolight from what must have been
NiCd cells (counting backwards from burn times), to NiMH cells (4/3A
sized 4000mAh Sanyo's), and the burn times increased very nicely. There
is a noticable "overdrain" though. I was runing the test with a 35W
bulb, and after the lighgt went off I let it be for a while, and then
tested again. It came back up real bright and all. With the NiCd once
it discharged, it was pretty drained. This suggests that the NiCd had a
flatter discharge curve than the current pack.

I am yet to see what happens to the battery pack with a 50W bulb
(4.2A dischage current, i.e. 1.05C of the cells, as this is already
beyond the recommended optimal range.

/Marcin