HP Compaq Presario,Presario 2105 Reference Manual page 49

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To preserve the life of a battery pack, be sure to charge it
regularly.
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If the notebook will be unused and unplugged for more than
2 weeks, remove and store the battery pack.
Ä
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High temperatures accelerate the self-discharge rate of a
stored battery pack. To prolong the charge of a stored battery
pack, place it in a cool, dry location.
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To maintain the accuracy of battery charge displays, calibrate
a battery pack that has been stored for one month or more
before using it.
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Avoid using or charging battery packs at high temperatures.
Reference Guide
To prevent damage to the battery pack, do not expose it to
high temperatures for extended periods of time.
Battery Packs and Power Management
3–7