La Crosse Technology BC-1000U - Manual (Page 41)

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6. Now, batteries in compartment 1 and 2 are being charged. Insert the third battery for ―Test‖ in
compartment 3.
7. Within 8 seconds from inserting the battery into compartment 3, press the corresponding
compartment key ―3‖. Then the No. 3 display will be flashing.
The No. 3 display will flash after the
compartment No. 3 is pressed