La Crosse Technology BC-500 - Manual (Page 13)

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rechargeable batteries will first be fully charged and then discharged to
determine the battery(s) capacity(s). They are then fully charged again.
During the first charging cycle, the display of current (Figure 8) and
voltage (Figure 9) will alternate on the LCD.
The charging current
Test mode
(Figure 8)
The charging voltage
Test mode
(Figure 9)