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If the ProTech Zoom 450 stays powered On when hooked up to a (power-providing!) USB port, then it is indeed the battery that is the problem.
Rechargeable batteries for electronic devices inevitably fail with time, and with use or with disuse in some cases, to hold enough charge, or to deliver enough power. This happens in from 1 1/4 (or rarely less) to 3 or 4 or so years.
When you replace the rechargeable battery pack inside it, be sure to first, before first using it, charge it up for 6 hours or so. This is needed because replacement batteries usually have been sitting on the shelf for awhile, and an extra time in the charger (even if it indicates it is fully charged up) helps before first usage.