LG Pra.L BLL1 Owner's Manual page 28

28 Operation
,
Note
y This unit can be used during charging.
y You can charge the unit to USB port (for charging) on the
bottom of unit.
y After the battery is fully charged, unplug the power to save
energy.
y The unit can be charged with a secondary battery with a
current output of 1 A and more at 5 V voltage.
y Keep the charging pins of unit free of moisture. Moisture can
cause the charging pins to corrode.