05 honda civic hybrid battery issues?

I have an 05 honda civic hybrid and at random times it will not start. Usually after not running for a good minute. I have a hunch its simply a bad 12v but i do not want to invest in that without further info. When driving the ima assist and charge works fine but the battery charge dies very quickly. It will also start just fine after a jump every time. Any info is appreciated ☺

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