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" recharging " carbon batteries by heating them.

12/26/2008 4:03 AM

I remember getting extra life out of 9 volt batteries by heating discharged ones. Might heating various types of batteries, or a new design, increase their power or longevity?

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Power-User

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#1

Re: " recharging " carbon batteries by heating them.

12/26/2008 6:06 AM

The heat makes the chemical reaction occur easier or faster. It doesn't really add charge to the battery. But if the battery tends to self-discharge, it speeds up that lossy effect.

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#2

Re: " recharging " carbon batteries by heating them.

12/27/2008 12:09 AM

You could get extra life out of the old zinc-carbon batteries by punching holes in the case and immersing in a sal ammoniac solution. When that wore out, you could still salvage some zinc and the carbon center electrode. Best to discard the black electrolyte.

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#3

Re: " recharging " carbon batteries by heating them.

12/27/2008 6:28 AM

All batteries give a little bit more voltage out when warm, rather than cold.

This is the reason that most smoke alarms need a new battery sometime between 1 and 5 am, which is usually the coldest part of the day, summer or winter, anywhere in the world. The battery (and the people around!) are at their "lowest ebb!".....

Which is why its a good idea to buy good quality batteries and also note the replacement day, so that you can replace on the same day each year, which is usually early enough that the battery is still just good enough to not quite need changing, eg. you won't be pulled out of bed in the middle of the night!!!

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#7
In reply to #3

Re: " recharging " carbon batteries by heating them.

01/07/2009 12:52 PM

I like your answer. You are right, my smoke detectors always ask for battery change in the middle of the night when it is cold. They never complain during the day.

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#8
In reply to #7

Re: " recharging " carbon batteries by heating them.

01/08/2009 11:22 AM

Years ago, I noticed this phenomena, it took me a bit of time to think of the reason why.

Of course, once known, its completely obvious.....

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#4

Re: " recharging " carbon batteries by heating them.

12/29/2008 6:42 AM

Hi all,

As I understand the chemical reaction inside the battery generates a layer of Hydrogen that isolated the graphite from the rest not allowing the reaction. If you heat the battery this layer of H2 is vanished and the battery can "work overtime".

Regards,

Ernesto

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Power-User

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#5

Re: " recharging " carbon batteries by heating them.

12/30/2008 1:32 AM

Any dry cell/battery can be refreshed- no need to warm in oven as my father did 60 years ago(radio batts- expensive)- just use dc volts from higher source for short time only- eg 1.5v cell etc- hold in hand- 12v from car batt- will feel cell warming up in say 5 secs- while ever cell stays warm- equal to new cell- can repeat many times!. Yes, if left on refresh could explode!. Works with carb/zinc, alk,li-ion,li-po(all supposedly not be recharged!. A dedicated dry cell recharger works too- but these apply a stepped charge at a low rate so cell/ batt never heats up. The trouble with recharging cells/batts is that they won't hold the charge for long- but - Hey!- if you are out in the bush- will save you!. Cheers.

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Guru

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#6

Re: " recharging " carbon batteries by heating them.

01/07/2009 2:47 AM

Beats me. Try asking this guy...

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