How much energy can you get from a lithium ion battery in a short amount of time?

is it dangerous to run a battery for 20 minutes rather than hours and drain the battery very quickly. also, how much energy can you get from doing this? i saw that you can get 150 watt hours per kg for li-ion batteries, but if i had, say 2 kg of battery, is it possible to run something for half an hour to drain... show more is it dangerous to run a battery for 20 minutes rather than hours and drain the battery very quickly. also, how much energy can you get from doing this? i saw that you can get 150 watt hours per kg for li-ion batteries, but if i had, say 2 kg of battery, is it possible to run something for half an hour to drain the whole battery or close to it, so i would actually get 600 watts for those 30 minutes?
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