TomTom's claim of 'up to 5 hours' is wildy exaggerated. Most get 2 to 2 1/2 at best. Mind you, the device is meant to run while attached to the car charger.
Also, have you checked Preferences-->Battery Savings options?
A lot of people (including me) have been burned by TomTom's deceptive advertising on this. The original units (300,700, x10 series) had 2300 mah batteries and lasted close to the 4 hours advertised.
In the newer thinner units - they put in a small sized (flat - so it would fit) 1200, mah battery and then advertised it as lasting 5 hours.
Do the arithmetic - 1/2 sized battery lasts longer (or so they advertise) ?
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