Sony VAIO VGN-FW Series, Operating Instructions - Hardware Manual

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Precautions >
Using the Battery Pack
Using the Battery Pack
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Do not leave battery packs 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 battery packs at temperatures between 10°C to 30°C. Lower temperatures require longer charging time.
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For your safety, it is highly recommended that you use genuine Sony rechargeable battery packs and AC adapters that
meet the quality assurance standard, supplied by Sony for your VAIO computer. Some VAIO computers may only function
with a genuine Sony battery pack.
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While the battery pack is in use or being charged, heat builds up in the battery pack. 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, such as dropping it on a hard surface.
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If you are not using your computer for a long period of time, remove the battery pack from the computer to prevent damage
to the battery pack.
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If you have not used the battery pack for a considerable amount of time, the remaining battery life may become short.
However, this is normal and does not indicate a malfunction, because the battery pack will gradually discharge over time
even when not in use. Connect the AC adapter to your computer and recharge the battery pack before using the computer
again.
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You do not need to discharge the battery pack before recharging.
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If the battery pack quickly runs out of power after fully charged, it may be reaching the end of its life and should be
replaced.