What are the battery temperature warnings I should be aware of?

Do not expose the unit to temperatures above 140°F (60°C), and do not charge the battery when the temperature is over 113°F (45°C). Do not store the unit in temperatures above 113°F (45°C) or below 32°F (0°C). The battery is not replaceable, so it should not be opened, disassembled, crushed, punctured, or disposed of in fire or water. (Page 3)