Installing A Battery; Storing A Battery - Dell M20 Quick Reference Manual

Installing a Battery

Slide the battery into the bay until the latch release clicks.
For information about installing the second battery, see your User's Guide.

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, charge the battery fully before you
use it.
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Dell Precision Mobile Workstation M20 Quick Reference Guide