Normally the recharable battery can power the navigation device up to 4-5 hours. Practical tests showed a typical battery life for the ECO 300 around 4h, the PRO BT is running around 5h. The PRO BT has a bigger casing and so a battery with more capacity fits in the unit. The ECO 300 has a 1000mAh LiPolymer battery, the PRO BT has 1700mAh. Charging takes typically 1,5 - 2h using the car charger or an opetional wall-plug charger. If you use a computer's USB outlet for charging, a full charge takes longer since a USB out is limited to 500mA charging current.