eli5: Why DSLR (and mirrorless) camera batteries so inferior compared to smartphones?

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I had Canons and Nikon DSLRs and lately a mirrorless Panasonic micro 3/4 and this always bugged me:
How come these camera batteries die within hours while only snapping a few pics here and there, while my iPhone (and I heard many androids are even better) last a full day (or more) doing a lot more processing intense tasks (watching HD videos, taking pictures, browsing the net, etc)
I have to carry 3-4 extra batteries when taking my “big” camera out for a hike and I’m not even shooting insane amounts of pictures.

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Anonymous 0 Comments

If you were to use your phone like a camera it would die rapidly too. The act of reading all that image data from the sensor, converting it to a digital file, and writing it onto memory consumes a lot of power.

Not to mention the act of needing to physically open and close shutters. There are compatively little moving parts in your phone and the size is smaller so it takes less power to move them.

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