ASUS B1M User Guide

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LED projector E-Manual
C.  Remove the old battery then insert the new CR2025 lithium coin 
battery into the battery holder with the positive side (+) facing 
up. 
D.   Slide the battery holder back into the battery compartment. 
Push it all the way in until you hear a soft click, indicating that 
the battery compartment is locked back in place.