Estimate Battery life on non-constant drain

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how can estimate/calculate current drain of project if current not constant
like:
for 4 seconds consume 5ma
for next second consume 40ma
and repeat

how can calculate how many days can run 50a 12v car battery (including others factors affect battery)

have @ this project. first half may not relevant half way down there's section 'calculating consumption' informative. i've been through same process myself several times can vouch it's correctness.


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