Not sure if it is a Tom Tom One or not, can you add the exact model if it is different?
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It looks like battery issues are common on that model. If it is within warranty, they should replace it. However, if you are outside of warranty, this video show how to replace the battery.
Have you tried any of the suggestions here?:
[[TomTom ONE Troubleshooting]]
Not sure if it is a Tom Tom One or not, can you add the exact model if it is different?