Long and short AA batteries

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gzt

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#233579 22-Apr-2018 19:31

I replaced some AA energizer batteries in a keyboard. The new AA black rattle around and do not make contact. Weird. I compared the physical size.

The AA Black are around 1.5mm shorter than AA Energizer from tip to tail.

Both sets were purchased from pak and save - not a $2 shop so I assume they are genuine. Does anyone know the story?

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Geektastic

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#2000785 22-Apr-2018 20:08

Definitely AA not AAA by mistake?

scuwp

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#2000788 22-Apr-2018 20:20

Never seen such a thing. My vote is you have AAA by mistake.

Alternatively the spring contacts sometimes compress, pry or pull them out gently (depending what contacts they have)

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sidefx

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#2000792 22-Apr-2018 20:33

Interesting, the datasheet does indeed give a range for the length with a difference of up to 1.3mm...

http://data.energizer.com/pdfs/lr6cl_eu.pdf

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gzt

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#2001031 23-Apr-2018 12:36

scuwp:
Never seen such a thing. My vote is you have AAA by mistake.

Lol no. ; ).

gzt

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#2001035 23-Apr-2018 12:41

sidefx:
Interesting, the datasheet does indeed give a range for the length with a difference of up to 1.3mm...

http://data.energizer.com/pdfs/lr6cl_eu.pdf

Strange. That might be the one.

Two of those in a row would give 2.6mm extra. The keyboard battery holder is unusual. It's 2x2, between each serial battery has a plastic separator. No springs just contacts.

The issue could be contact compression (as mentioned by scuwp) caused by the larger battery or maybe it's specified for the 1.3mm longer length alkaline. I'll take a look..

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#2001048 23-Apr-2018 12:47

I have some AA NiMh batteries from the Warehouse (still have them actually) and the positive tip on the battery is noticably shorter than a normally battery. It does fail to make contact in some devices.

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gzt

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#2001056 23-Apr-2018 12:52

Tips and bottom indentation etc in this case look exactly the same. Overall length is longer in the energizer or shorter in the back aa I got. Don't know which yet but spec indicated it's the energizer unless the black also goes plus or minus then it could really add up ; ).

Gordy7

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#2001100 23-Apr-2018 13:57

Manufacturing 1,000,000 shorter AA batteries means that you can manufacture an extra 26,000.

Gordy

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