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Oldham KL3 (Eveready B103)

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Oldham KL3 (Eveready B103)

Post by malcscott » Fri Feb 06, 2015 12:17 pm

Hi, i am restoring an Eveready C/A radio. It still has an Olham KL3 battery inside it which looks as good as new.
I intend to restuff it with 10 PP3. Which are the best ones for the job? Cheers, Malc.

 
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Re: Oldham KL3 (Eveready B103)

Post by Michael Watterson » Fri Feb 06, 2015 2:07 pm

Probably doesn't make much difference for PP3, except to shelf life. See below.

60 x Alkaline AA in 6 x 10 way holders has hugely better shelf life (up to 10 years!) and works out cheaper per hour listening.

I now put 30mA to 100mA fuse on HT!

Use 2 x Alkaline D (same pack) in parallel for L.T. for similar life to 4 x D cells in Parallel. Tell me if the LT in your KL3 are D cells or the F cells in a PJ996 pack (F are same diameter, but 1/2 as long again in size, i.e. Zinc D is 2/3rds length and capacity of F) and how many?

I presume the HT is layer cells maybe PP7 or PP9 size, not sure which. Dimension of one stack of 15 would be good. I bet 4 x stacks of 15 in series. Most packs seem to be like that.

The Layer PP3 (6F23) are all similar. About 450mAH = about 45 Hours in Model C/A

The Alkaline PP3 (6LR61) with 6 x AAAA inside are about 560mAH, about 56 Hours in Model C/A. Only advantage is the 4 to 6 years shelf life vs 1 year shelf life.

Some Alkaline are rectangular button cell in a plastic case. At least they look like that. I'm shortly going to dissect two brands to see if they are lying.

Layer cells have much longer life than Zinc Carbon Cylindrical for same volume, but only at low current drain as they are higher resistance.

The often claimed x5 life of Alkaline and x2 of Zinc Chloride (HP) over Zinc Carbon is only at very high current loads where NiMH makes more sense. At low currents like in a Valve Portable HT, there is no advantage to Chloride at all, and Alkaline are about x2 to x2.5 better.
The 1.5V LT always used paralleled cells (tested first!) as 4 x parallel D Zinc at 125mA will last maybe x6 to x longer rather than x4 longer due to lowered internal losses.

 
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Re: Oldham KL3 (Eveready B103)

Post by malcscott » Fri Feb 06, 2015 3:39 pm

Thanks Michael, i have bought 10 x Kodak PP3 for £5. I will take the old battery apart tomorrow and post some pics.
Cheers, Malc.

 
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Re: Oldham KL3 (Eveready B103)

Post by Michael Watterson » Fri Feb 06, 2015 3:54 pm

Was that 6F23 (layer) or 6LR61(Alkaline)?

 
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Re: Oldham KL3 (Eveready B103)

Post by malcscott » Fri Feb 06, 2015 6:28 pm

Zinc chloride, 6F22 E-block

 
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Re: Oldham KL3 (Eveready B103)

Post by Michael Watterson » Fri Feb 06, 2015 7:06 pm

It's Layer type. Zinc Carbon / Zinc Chloride doesn't apply to layer type, only to cylindrical cells. The old SP or U or LP are Zinc Carbon and HP = Zinc Chloride (which use Carbon Rod too).
Layer cells only ever had one chemistry as far as I know.

So about 45 hours run time and 1+ year shelf life. Quite cheap. :)

My typo earlier, should have been 6F22 ( 6 cells, F = Layer, 22=size code)

Alkaline 6LR61 ( 6 cells L= Alkaline, R = cylindrical i.e. Round, and 61=size code)

E Block is just the physical size, never battery construction.

 
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Re: Oldham KL3 (Eveready B103)

Post by malcscott » Sat Feb 07, 2015 11:03 am

Hi, does anyone have a B013 battery which they have re- stuffed? A couple of pics of the internals would be handy. Cheers, Malc.

 
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Re: Oldham KL3 (Eveready B103)

Post by Michael Watterson » Sat Feb 07, 2015 11:16 am

Yes.
B103_inside.jpg


B103_AA_folding.jpg



Also Scroll down here:
http://www.radiomuseum.org/forum/ever_r ... _ca.html#1

Exactly what is it you want to know?

If using PP3, they replace the 60 x AA.

The LT can be 1 x Alkaline D Cell. But 2 to 4 matched new ones in parallel will give disproportionately better life and work out cheaper.

The black box on mine is a PJ996 (2.50 Euro!) with top levered off. Pops off easily with a broad screwdriver. Then wiring changed from series to parallel. That's exactly what is inside an AD4 1.5V pack.

 
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Re: Oldham KL3 (Eveready B103)

Post by malcscott » Sat Feb 07, 2015 2:08 pm

The cardboard case is glued tight. Do i cut it open with a stanley knife?

 
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Re: Oldham KL3 (Eveready B103)

Post by Michael Watterson » Sat Feb 07, 2015 2:44 pm

steam it at seam over a small pot
That's how I take apart battery packs.

(My B103 is a replica fabricated in a top & bottom half for easier refills, but I have four or five smaller vintage packs I steamed open)


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