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Help in a physics experiment

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Hey! 

Does anybody know how to heat up a battery by around 1-2 degrees? Will it work if I put the battery in warm water inside a small bag of some sort, or will the battery undergo some reaction and get spoilt? To be precise, I need to hit the battery in different ways, by 1,2,3,4, and 5 degrees to conduct an experiment. If anybody knows any ways of doing that, it would be much appreciated :)

Thanks! 

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I am not sure what you are trying to accomplish by changing the temperature, because it will still be at whatever voltage it was at before?

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Sorry, I'll be more specific.

This experiment is actually for my physics IA, for which I'm trying to see how temperature affects the internal resistance (and hence voltage output/efficiency) of a battery. I just want to find a way by which I could heat the battery without damaging the battery. I can't place it directly in water as it will react, I can't put it in a microwave there is a chance of a tiny explosion. What i thought of was to place the battery in a steel container and put it in the water bath, this will probably be the safest and most efficient way of heating the battery.  Was wondering if there was anything better though?

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Thanks for your input! My problems are solved now, I found out that my school has a temperature probe, which makes measuring the temperature of a battery much easier!

Edited by I.B
misclick :/

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