
I needed a power source so I didn't have to change batteries every few hours. I use my camera for astrophotography; I take repeated exposures from 20 seconds to several minutes when photographing deep sky objects and I don't have to change the battery after a series of 50 exposures in the dark because I risk losing the subject. I gave the product 4 stars instead of 5 because I only used it once. I might add a 5th star when I see how long it lasts.

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