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'[OT]: Jelly lead acid acc. and temp'
2002\10\06@101919 by Attila Muhi

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Hi,

Anyone knows if a jelly lead acid accumulator can withstand low temperatures ?
What happens if it is exposed to low temperatures when it is discharged ?
In my application, it can be surrounded by in worst case -30 degrees C, and the acc will be cyclic operated. I know that a car or motorcycle accumulator with liquid electrolyte doesn't appreciate to be left cold if it is discharged, but does the same apply to jelly acc:s ?

So, if it doesn´t work, will NiMH:s or NiCd:s behave better ? I don't need to draw a lot of current, max 150 mA peak.

Regards

Attiola - SM4RAN

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2002\10\06@125736 by Peter L. Peres

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On Sun, 6 Oct 2002, Attila Muhi wrote:

*>Hi,
*>
*>Anyone knows if a jelly lead acid accumulator can withstand low temperatures ?
*>What happens if it is exposed to low temperatures when it is discharged ?

*>In my application, it can be surrounded by in worst case -30 degrees C,
*>and the acc will be cyclic operated. I know that a car or motorcycle
*>accumulator with liquid electrolyte doesn't appreciate to be left cold
*>if it is discharged, but does the same apply to jelly acc:s ?

Yes.

*>So, if it doesn´t work, will NiMH:s or NiCd:s behave better ? I don't
*>need to draw a lot of current, max 150 mA peak.

Imho try to use a Lithium battery. Lithium likes it cold afaik.

If you draw 150mA continuously the battery will self heat a little, if you
provide some insulation it may be enough. When it will be discharged it
will be most sensitive to low temperatures.

I seem to remember that gel becomes hard and cracks into pieces when ice
forms in it. Then the gel will no longer be between the plates when it
thaws ...

The manufacturer always specifies operating and storage temperature. Get
some real data. -30C is too loow for most batteries except some
milspec items that are unobtainable afaik (and I've only seen them in
catalogs).

Peter

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