Dell Vostro 1200 (Early 2009) - Manual (Page 37)

Using a Battery 37
5 To replace the battery, follow the removal procedure in reverse order.
Storing a Battery
Remove the battery when you store your computer for an extended period of
time. A battery discharges during prolonged storage. After a long storage
period, recharge the battery fully (see "Charging the Battery" on page 35)
before using it.
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