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Basic Question about Measuring Battery Discharge/Consumed Energy

Basic Question about Measuring Battery Discharge/Consumed Energy

Basic Question about Measuring Battery Discharge/Consumed Energy

(OP)
Hi,

I have no idea about batteries and energy measurements.
I need to calculate the expected life of a lets say 1300mAH battery (laptop) when a function that costs 750 mW is executed for 2 hours continuously.

What is the math formula?

Thank you very much and sorry if I asked something off topic or too simple!   

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