On Using The Battery Pack - Sony PCG-K215B Hardware Manual

On using the battery pack

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Never leave the battery pack in temperatures above 60°C, such as in a car parked in the sun or under direct sunlight.
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Battery life is shorter in a cold environment. This is due to decreased battery efficiency at low temperatures.
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Charge the batteries at temperatures between 10°C to 30°C. Lower temperatures require a longer charging time.
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While the battery is in use or being discharged, the battery pack heats up. This is normal and is not cause for concern.
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Keep the battery pack away from all sources of heat.
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Keep the battery pack dry.
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Do not open or try to disassemble the battery pack.
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Do not expose the battery pack to any mechanical shock.
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If you are not using the computer for an extended period of time, remove the battery pack from the computer to prevent damage
to the battery.
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If, after fully charging the battery pack, the battery power is still low, the battery pack may be reaching the end of its life and
should be replaced.
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You do not need to discharge the battery before recharging.
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If you have not used the battery pack for a considerable amount of time, recharge the battery.
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Precautions