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The OP question has been flogged to death. Thread closed.
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USB power banks typically use switching power supplies, which can introduce noise that may affect sensitive equipment like spectrometers. A pure 5V output without switching noise is desired for optimal performance. While lithium batteries output 3.7V, achieving a stable 5V requires either a linear regulator or a DC-DC converter, both of which have their drawbacks. Concerns about overvoltage and ripple voltage are significant, especially for expensive devices, leading to a preference for reliable, tested power solutions. The discussion emphasizes the need for a compact, ready-made power bank that can deliver pure 5V without the risks associated with converters.