1. Your new 640m battery comes in a discharged condition and must be charged before use. 2. When charging 640m battery for the first time your computer may indicate that charging is complete after just 10 or 15 minutes. 3. If 640m battery will not be in use for a month or longer, it is recommended that it be removed from the device and stored in a cool, dry, clean place. 4. It is normal for 640m battery to become warm during charging and discharging. 5. A charged 640m battery will eventually lose its charge if unused.
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