Nextar Automative navigation system Instruction Manual page 12

Working conditions and precautions for the rechargeable battery
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Battery should only be used and charged when temperatures are between
32q-100qF.
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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.
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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 by using the supplied adaptor.
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Power Supply
Preparation
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