Moderator corrected spelling and punctuation for clarity and readability.
Usually an old (or older) battery will no longer hold a charge ... or will only hold a small charge (that will let you run the GPS for only a few minutes).
Often, when the TomTom device is always connected to the charger (in a vehicle), where it charges every time the car is turned on, whether the TomTom is being used or not, the battery gets charged (partially or fully) often enough to use up the "maximum number of charge" cycles for the battery. Hence, it will no longer charge properly or hold a strong charge.
Like for all lithium batteries, it's better if your device is not always connected and being charged (whether you are or are not using it). The battery will last longer and it will still be able to hold a stronger charge.
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