Nextar K4 User Guide - Page 11

Power Supply Preparation About Rechargeable Battery Your portable GPS comes with a built-in rechargeable battery. Charge the battery fully before initial use. Charging time is normally about 3.5 hours. A fully charged battery delivers about 2 hours of use. Working conditions and precautions for the rechargeable battery New batteries should be fully charged before initial use. Battery should only be used when temperatures are between 14°-140°F (-10℃-60 ℃). And it should be charged when temperatures are between 32°-113°F(0℃-45 ℃) Maintain well-ventilated conditions around the product to avoid overheating. Don't put the product on a bed, sofa or anything that may block ventilation to the product. When the battery is weak, an indication menu will appear on the LCD screen and after a little while, the unit will power off automatically. Charging the Battery Pack The battery must be charged using the supplied adaptor. 11