La Crosse Technology BC-500 - Manual (Page 15)

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When the rechargeable batteries are fully charged, the capacity (Ah)
(Figure 12) and the voltage (V) (Figure 13) will be shown alternately with
“FULLTEST” displayed on the LCD.
Note: When any one of the batteries is in the test mode, do not change
the other battery(s). To test additional battery(s), you must remove and
reinstall the testing batteries and then reset the mode.
The capacity
Test mode
(Figure 12)
The voltage
Test mode
(Figure 13)