Dell Latitude 7230 User Manual page 6

2. Insert a maximum of two tablet batteries with their contacts facing down
all the way into the battery compartments until they click into place and the
corresponding LED indicator lights up. The battery will take up to two hours to
charge depending on its power level.
NOTE: When two batteries are inserted at the same time, the battery in
the front compartment (closest to the Dell logo) will charge first. Once the
front battery is fully charged, the battery in the rear compartment will begin
charging.
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6 Setting up the charger