Dell Inspiron 1720 (Mid 2007) - Manual (Page 53)

Using a Battery
53
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 51)
before you use it.
1 battery 2 battery release latches (2)
2 1