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[–]bobbobbybob 5 insightful - 3 fun5 insightful - 2 fun6 insightful - 3 fun -  (1 child)

what an interesting question.

did a bit of research. fun papers like: https://www.researchgate.net/publication/257172972_Self-discharge_characteristics_of_a_metal_hydride_electrode_for_Ni-MH_rechargeable_batteries

main factors seem to be: temperature.

maybe the pack is cooler?

I mentioned elsewhere a theory of increased electron migration due to the large surface area of the connected circuit. Can't find any papers on that but am happy to do the experiment and publish if someone wants to pay for it

[–][deleted] 3 insightful - 2 fun3 insightful - 1 fun4 insightful - 2 fun -  (0 children)

Already known. But i like your way of transporting general physics knowledge to the public.