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Homemade packs

Philip
 

HOWEVER, use caution when soldering up your pack and be especially careful not to accidentally cause a short circuit with your jumpers. Take your time.

There is a lot of energy bound up in even uncharged cells and things can get exciting VERY quickly in an unpleasant way. AND, be sure to include a fuse on the positive pack pigtail when you are done.

Philip
KA4KOE

--- In Racal-manpacks@..., Stuartjmckinnon@... wrote:


In a message dated 28/02/2010 14:00:08 GMT Standard Time, kludge@...
writes:




They are NiCd batteries and they are 24 volt packs so you want 20 cells
in series. That's a lot of cells.

You cannot solder to the cells directly without risking damage, but you
can buy cells with tabs attached which you can solder together. Your local
battery recelling shop can spotweld the whole pack together if you want to
go that way also.
--scott





Well done Scott

Thanks

stuart
Help!

pdq143
 

Hi I have just joined your group as I am interested in this kind radios and I am also looking for info about the Racal BCC 66HD. I need to find the specs and circuit diagram + info about the rest of the kit for this radio.

Thanks
Jake.
Re: Syncal batteries

 

Forgive my ignorance, but why is it not acceptable? I don't think I'm
alone in doing this!
NiCds have a fairly wide charge range where they are happy. NiMH cells
are very, very easy to damage in comparison.
--scott
Re: Syncal batteries

 

Stuartjmckinnon@... wrote:


In a message dated 01/03/2010 18:30:48 GMT Standard Time, danrae@... writes:


. Fine for NiCds, not really acceptable for NiMh, pretty
> much out of the question for anything else.
> --scott
>
>
>
You could well be right Scott, but since Nicads are getting hard
to find
anyway, I will continue to use NiMH cells and charge them with
constant
current, from the regular external charger who's number escapes me
(nothing in the Syncal itself), which works for fine me, so far...
Famous last words maybe.

Forgive my ignorance, but why is it not acceptable? I don't think I'm
alone in doing this!

Dan

Dan
Is the Racal charger you mention the 945S??
Stuart

After a trip to the garage to check; the MA 945 B, yes. I usually give the 7 Ah pack 24 hours instead of the 14 hours for the lower capacity pack. It's been about three years now, so far, so good.
dr
Re: Syncal batteries

 

Scott Dorsey wrote:
What has advanced in more recent years has been
more charging than actual battery chemistry; lithium accumulator chemistry
has been around for years but actually charging them consistently without
wrecking them is nontrivial.

The charging circuit in the Syncal-30 itself is just a constant-current source, sort of... Fine for NiCds, not really acceptable for NiMh, pretty
much out of the question for anything else.
--scott


You could well be right Scott, but since Nicads are getting hard to find anyway, I will continue to use NiMH cells and charge them with constant current, from the regular external charger who's number escapes me (nothing in the Syncal itself), which works for fine me, so far... Famous last words maybe.

Forgive my ignorance, but why is it not acceptable? I don't think I'm alone in doing this!

Dan
Re: Syncal batteries

 

Well, if there are 19 cells in the pack, that would explain why I had
such a hard time getting 20 cells in there.

The higher voltage per cell on charging probably reduces the battery
lifetime a bit.

I certainly would not recommend using Nicads nowadays with more modern
chemistry cells available, since they are prone to leak and the new ones
mostly do not.
That's fine if you have a charger for whatever other battery technology
you're going to use. What has advanced in more recent years has been
more charging than actual battery chemistry; lithium accumulator chemistry
has been around for years but actually charging them consistently without
wrecking them is nontrivial.

The charging circuit in the Syncal-30 itself is just a constant-current
source, sort of... Fine for NiCds, not really acceptable for NiMh, pretty
much out of the question for anything else.
--scott
Re: Syncal batteries

 

开云体育

In a message dated 01/03/2010 18:30:48 GMT Standard Time, danrae@... writes:
?

Scott Dorsey wrote:
> What has advanced in more recent years has been
> more charging than actual battery chemistry; lithium accumulator chemistry
> has been around for years but actually charging them consistently without
> wrecking them is nontrivial.
>
> The charging circuit in the Syncal-30 itself is just a constant-current
> source, sort of... Fine for NiCds, not really acceptable for NiMh, pretty
> much out of the question for anything else.
> --scott
>
>
>
You could well be right Scott, but since Nicads are getting hard to find
anyway, I will continue to use NiMH cells and charge them with constant
current, from the regular external charger who's number escapes me
(nothing in the Syncal itself), which works for fine me, so far...
Famous last words maybe.

Forgive my ignorance, but why is it not acceptable? I don't think I'm
alone in doing this!

Dan

Dan
?
Is the Racal charger you ention the 945S??
?
Stuart
Cool HarleyBoyz wants to add you as a friend :)

hotspcoolguy
 

I want to add you as a friend so you can see my profile with my pictures.Here is the link:
Re: Syncal batteries

 

My manual states that there are 19 cells in the MA934 battery pack, and indeed that is what was in mine ( ex-Iraqi military). I was easily able to re-cell mine with generic Chinese made D size NiMH cells with solder tags on them. The capacity is a lot higher than the original Nicads, 7Ah. Due to the way these are wired and arranged it would be difficult to use a supplied made up pack, since these come shrink wrapped, so to speak. Maybe the lesser number of cells was to keep the fully charged voltage down a bit. I think you can find C size NiMH with capacity similar to the original Nicads, but I like having the extra capacity.

I certainly would not recommend using Nicads nowadays with more modern chemistry cells available, since they are prone to leak and the new ones mostly do not.

Dan

ac6ao / g3ncr
Re: SE6861 Battery packs on Ebay

 

开云体育

In a message dated 28/02/2010 19:12:56 GMT Standard Time, vtuff59795@... writes:
?

Sorry Guys,
????????????????????for those people who like to see exactly what sort of silly money some things bring on Ebay have a look at this:
?
?
Amazing!
?
BTW, I have some rare as hens teeth Plessey battery packs for the Raven series available at slightly less than those AEG NiCad's ;-)
?
?
?
73's

Vic
G7PYR

Vic
?
Are you having difficulty with e mail, I have asked a couple of times now about 10 way plugs/cable?
?
And prey tell us all, how much those 20yr old batteries are?
?
Stuart and company
Re: SE6861 Battery packs on Ebay

 

开云体育

Sorry Guys,
????????????????????for those people who like to see exactly what sort of silly money some things bring on Ebay have a look at this:
?
?
Amazing!
?
BTW, I have some rare as hens teeth Plessey battery packs for the Raven series available at slightly less than those AEG NiCad's ;-)
?
?
?
73's

Vic
G7PYR
Re: S batteries

 

They are NiCd batteries and they are 24 volt packs so you want 20 cells
in series. That's a lot of cells.

You cannot solder to the cells directly without risking damage, but you
can buy cells with tabs attached which you can solder together. Your local
battery recelling shop can spotweld the whole pack together if you want to
go that way also.
--scott
Re: S batteries

 

On the subject of Syncal 30 packs, I have rebuilt a couple of them and I
just could not get the modern D cells to fit inside there. I wound up
using C cells and packing the extra space in there with packing foam.

This results in very easy assembly that you can do yourself on the kitchen
table, and much greater capacity than the packs had when they were new
(although a good bit less than if you'd used modern D cells). Just as
importantly, it means packs that weigh maybe a third less, and that is a
fine thing when you are carrying the radio up a mountain.

Charge rate seems to be okay. Have not had any problems in a couple years
of occasional use.
--scott
Re: SE6861 Battery packs on Ebay

 

开云体育

In a message dated 28/02/2010 14:57:50 GMT Standard Time, vtuff59795@... writes:
?

WOW!
????????????who was the keen type that paid 212 Euros for two dead SE6861 battery packs on Ebay?
?
I paid only slightly more than tah for a brand new old stock 6861 transceiver!!!
?
73's

Vic
G7PYR

Vic
?
Did you find any 10 way connectors with or without cable ex plessey?
?
Stuart
?
When wanting a laugh, please include e bay number! cheers
Re: SE6861 Battery packs on Ebay

 

开云体育

WOW!
????????????who was the keen type that paid 212 Euros for two dead SE6861 battery packs on Ebay?
?
I paid only slightly more than tah for a brand new old stock 6861 transceiver!!!
?
73's

Vic
G7PYR
Re: S batteries

 

开云体育

In a message dated 28/02/2010 14:00:08 GMT Standard Time, kludge@... writes:
?

They are NiCd batteries and they are 24 volt packs so you want 20 cells
in series. That's a lot of cells.

You cannot solder to the cells directly without risking damage, but you
can buy cells with tabs attached which you can solder together. Your local
battery recelling shop can spotweld the whole pack together if you want to
go that way also.
--scott

Well done Scott
?
Thanks
?
stuart
Re: S batteries

 

开云体育

In a message dated 28/02/2010 13:46:06 GMT Standard Time, kludge@... writes:
?

On the subject of Syncal 30 packs, I have rebuilt a couple of them and I
just could not get the modern D cells to fit inside there. I wound up
using C cells and packing the extra space in there with packing foam.

This results in very easy assembly that you can do yourself on the kitchen
table, and much greater capacity than the packs had when they were new
(although a good bit less than if you'd used modern D cells). Just as
importantly, it means packs that weigh maybe a third less, and that is a
fine thing when you are carrying the radio up a mountain.

Charge rate seems to be okay. Have not had any problems in a couple years
of occasional use.
--scott

Scott
?
Apart from my one Brand new battery pack as it was when I got it 5 or 6 years ago, most of the 3/4 others are all but done for, can you recall how many 'c' types etc, in case anyone wants to try re celling?, and are they Ni cad or Mi mh?
?
Cheers
?
Stuart
G0TBI
Re: S batteries

 

开云体育

In a message dated 27/02/2010 21:10:04 GMT Standard Time, M1CCF@... writes:
Ben

While talking of batteries, would it be worth thinking about Syncal 30
battery packs?

Mike B
----------------------
?
Possibly but I'm only working on the 6861 at the moment.
?
BN
?
Re: S batteries

Michael Buckley
 

Ben

While talking of batteries, would it be worth thinking about Syncal 30 battery packs?

Mike B

On 27/02/2010 20:55, Military1944@... wrote:


SE6861 batteries
I contacted a battery supplier. He can make up a pack of 12 sub C cells
which will fit inside the SE6861 battery case, various capacities.
14.4V 2500mAh 21.00
14.4V 3300mAh 26.00
14.4V 3700mAh 32.00
14.4V 4300mAh 42.00
14.4V 4600mAh 49.00
Anyone interested in making up a bulk order ? I would be happy with the
first option, 2500mAh.
Anyway, let me know and if there's enough interest I'll see what can be
arranged. I would be willing to have them posted here and post them on
afterwards but I'd want payment for the batteries first then payment of
local post costs plus a division of the initial charge.
Ben.
SE6861 batteries

 

开云体育

SE6861 batteries
?
I contacted a battery supplier. He can make up a pack of 12 sub C cells which will fit inside the SE6861 battery case, various capacities.
?
14.4V 2500mAh ?21.00
14.4V 3300mAh ?26.00
14.4V 3700mAh ?32.00
14.4V 4300mAh ?42.00
14.4V 4600mAh ?49.00
?
Anyone interested in making up a bulk order ?? I would be happy with the first option, 2500mAh.
?
Anyway, let me know and if there's enough interest I'll see what can be arranged. I would be willing to have them posted here and post them on afterwards but I'd want payment for the batteries first then payment of local post costs plus a division of the initial charge.
?
Ben.
?
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