Eng Pro Guide Exam 1 (Batteries) - Power Exam Sub Forum - Engineer Boards
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# Eng Pro Guide Exam 1 (Batteries)

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Can someone please help me understand why increasing ambient temperature help increase the output capacity of the battery? What exactly do they mean by output capacity of battery?

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Any battery is an electro-chemical device.  Increasing temperature tends to increase the energy released by the chemical reaction.  As an every-day example, it's why your car battery may work just fine on a 70 degree day and not be able to start the car when it's 30 outside.

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4 hours ago, TakiTaki said:

Can someone please help me understand why increasing ambient temperature help increase the output capacity of the battery? What exactly do they mean by output capacity of battery?

Batteries perform better in higher temperatures except for extreme temperatures.

Batteries have internal resistance (there are some good YouTube videos on this).  Imagine a 12 volt battery.  The load will not draw a full 12 volts because there is a small voltage drop due to this internal resistance.  12V = Vdrop + V_load.

In slightly warmer environments (not extreme), this resistance is less allowing for more output (volts provided to the load).

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2 hours ago, Flyer_PE said:

Any battery is an electro-chemical device.  Increasing temperature tends to increase the energy released by the chemical reaction.  As an every-day example, it's why your car battery may work just fine on a 70 degree day and not be able to start the car when it's 30 outside.

I didn’t see your answer.  Sorry didn’t mean to give a competing explanation.

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On 10/5/2019 at 8:43 PM, Wow! said:

I didn’t see your answer.  Sorry didn’t mean to give a competing explanation.

No worries.  I should have added that, for vented lead acid cells, you can find correction factors for temperature vs. battery capacity in IEEE Standard 485 (Sizing) and 450 (Maintenance and Testing).

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