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AA batteries

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Clive Hartland26/07/2021 22:00:37
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2719 forum posts
40 photos

I recently bought some AA batteries, a box of 40.

Needing to change the batteries in the house fone I tipped out the old ones and inserted the new fresh ones but found that the + contact did not reache the contact in the battery holder.

I am convinced that the new batteries + end is shorter than it should be.

I will now have to commit surgery on the battery box to cut away part of it to allow full contact.

The batteries came from a reputable supplier.

Grindstone Cowboy26/07/2021 22:11:36
683 forum posts
58 photos

I've been finding this more and more recently - but I also think the length of the cells is increasing as they appear to be harder to fit into the available space. Duracell seem to be the major culprits, but I've also noticed that Panasonic Eneloop rechargeables are bigger than the traditional cells. Things like Nikon Speedlights seem to have enough latitude built-in to cope, but older TV remotes are definitely on the lower end of the tolerances.

Rob

Michael Gilligan26/07/2021 22:40:08
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18734 forum posts
916 photos

Energizer quotes “industry standard” dimensions : **LINK**

https://data.energizer.com/pdfs/l91.pdf

I would be interesting to know how yours compare

MichaelG.

AJAX26/07/2021 22:44:19
207 forum posts
42 photos
Posted by Clive Hartland on 26/07/2021 22:00:37:

I recently bought some AA batteries, a box of 40.

Needing to change the batteries in the house fone I tipped out the old ones and inserted the new fresh ones but found that the + contact did not reache the contact in the battery holder.

I am convinced that the new batteries + end is shorter than it should be.

I will now have to commit surgery on the battery box to cut away part of it to allow full contact.

The batteries came from a reputable supplier.

Was that a BT cordless phone by any chance? I had exactly the same problem when I changed batteries but when I prised the spring clips out a bit it was enough to make good contact. Alternatively I could have bought the BT approved/branded replacements instead at an inflated price.

Update - my phone uses AAA and not AA batteries.

Grindstone Cowboy26/07/2021 23:11:22
683 forum posts
58 photos

Some rough measurements using digital calipers

Duracell AA cell Panasonic Eneloop

Diam 13.91 to 14.30 (not truly circular) 14.18 to 14.45

Overall length 50.67 50.43

Main body length 48.80 49.17

Pos terminal 1.88 1.30

The plastic sleeve makes accuracy difficult as you get difference depending where exactly you measure, but the above are as close as I could get. Also had to be quick as the caliper were effectively shorting out the cell on a couple of the measurements.

So it seems they are both within spec apart from the diameter of the Duracell in certain orientations.

I'll try a few others.

Rob

Edit - Drat! The careful formatting didn't work - first figures are Duracell, second are Eneloop

Edited By Grindstone Cowboy on 26/07/2021 23:12:34

noel shelley26/07/2021 23:38:53
720 forum posts
19 photos

A dab of solder on the contact should work ! Noel.

Bazyle27/07/2021 00:42:18
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6010 forum posts
220 photos

Scrunched up heavy tinfoil eg from pie case.

J Hancock27/07/2021 08:25:37
699 forum posts

Yes, exactly same problem , the cap end would not reach the contact plate in the can opener.

Soldered a 'blob' onto the contact plates , fits all batteries now.

Macolm27/07/2021 09:17:55
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48 forum posts
6 photos

Another thing to watch is projection of the plastic sleeve at the negative end. Intemittent problems with replacement AAA rechargables in out Panasonic phones were due to poor contact due to this. They are now fine after trimming flush with a razer blade.

Nick Clarke 327/07/2021 09:37:38
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1247 forum posts
49 photos

Naming an offender IKEA yellow AA batteries will not work in my Worcester Bosch wireless central heating controller for just this reason

Oily Rag27/07/2021 09:56:35
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460 forum posts
147 photos

And I thought this was a thread about Flak Batteries from WWII !!!!

Vic27/07/2021 12:11:12
2895 forum posts
8 photos
Posted by Oily Rag on 27/07/2021 09:56:35:

And I thought this was a thread about Flak Batteries from WWII !!!!

laugh Good one!

Clive Hartland27/07/2021 13:34:00
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2719 forum posts
40 photos

Hi AJAX, no, not a cordless fone,just a house fone with answerfone.

This is not the only item I have found with battery insert problems and to my mind the makers have changed the

design slightly.

Answers show it is a problem for people.

bernard towers27/07/2021 13:56:47
275 forum posts
82 photos

I thought it was more that the battery boxes in stuff made in you know where are a bit scant on dims. American stuff that takes batts is ok, or mine is!!

Peter Spink27/07/2021 13:58:59
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117 forum posts
41 photos
Posted by Grindstone Cowboy on 26/07/2021 23:11:22:

Some rough measurements using digital calipers . . .

Do you now have lots of flat batteries? devil

roy entwistle27/07/2021 15:54:46
1401 forum posts

Anyone measuring batteries with calipers, insert a piece of writing paper between one end of battery and caliper,

then measure thickness of paper. deduct paper thickness from battery length.

This is not meant to be patronising in any way

 

I have found some batteries that vary in the same pack

Edited By roy entwistle on 27/07/2021 15:58:58

Oven Man27/07/2021 16:48:06
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152 forum posts
22 photos
Posted by roy entwistle on 27/07/2021 15:54:46:

Anyone measuring batteries with calipers, insert a piece of writing paper between one end of battery and caliper,

then measure thickness of paper. deduct paper thickness from battery length.

This is not meant to be patronising in any way

I have found some batteries that vary in the same pack

Edited By roy entwistle on 27/07/2021 15:58:58

This is where a cheapo plastic vernier caliper comes in really useful.

Peter

Oldiron27/07/2021 16:58:38
831 forum posts
23 photos
Posted by Peter Spink on 27/07/2021 13:58:59:
Posted by Grindstone Cowboy on 26/07/2021 23:11:22:

Some rough measurements using digital calipers . . .

Do you now have lots of flat batteries? devil

exactly what I was thinking. devil

regards

Grindstone Cowboy27/07/2021 17:37:04
683 forum posts
58 photos
Posted by Oldiron on 27/07/2021 16:58:38:
Posted by Peter Spink on 27/07/2021 13:58:59:
Posted by Grindstone Cowboy on 26/07/2021 23:11:22:

Some rough measurements using digital calipers . . .

Do you now have lots of flat batteries? devil

exactly what I was thinking. devil

regards

Not flat, but one got a little warm blush

Peter Greene27/07/2021 22:54:09
272 forum posts
2 photos
Posted by roy entwistle on 27/07/2021 15:54:46:

then measure thickness of paper. deduct paper thickness from battery length

... or just zero the calipers with the paper in.

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