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Here is a battery 12 V 7 Ah, theoretically capable of supplying 7 Amps for 1 hour ...

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Between its 100% charge and its complete discharge (to avoid because irreversible), it will provide 7 Ah, its capacity (example 2: 1 Ampere for 7 hours)

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It is therefore advisable to keep 10 to 20% capacity, here we will use 6 Ah

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With our bulb 2 Ampèresn we will get 3 hours of autonomy (6/2)

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Any natterie has a maximum intensity due to its internal resistance. On a car model it is noted (ex 400 A for an 80 Ah)

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Here are 1.8 and 3 Ah batteries

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And a drill battery 1.5 Ah

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The drill has an autonomy of approximately 15 minutes (minutes) in permanent use, one can estimate its consumption: 1.5 A * 4 (60 mn / 15 mn) * 18 V = 90 Watts

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Here 1.5 Ah for 12 V and 17 Wh mentioned (instead of 18: 1.5 * 12). So 17 Watts for 1 hour, we find the use of Wh on laptop batteries

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Here is for this panorama of accumulators, thank you for your expectation