Good brightness, poor endurance

These lights are quite bright--no complaints there. However, they barely last four hours. I use them to light my way up my front steps when I return home from business trips late at night, and by midnight or 1 AM they are either out or on a slow flicker that seems to indicate they are running low on battery. They charge in direct sunlight, so I don't think the issue is the amount of power they're getting. They just don't last the night.

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