Hitachi AMS 2000 Series Service Manual page 132

4. While the battery is charging, the green Ready LED blinks slowly. Charge
the battery until Ready LED stops blinking and changes to steady ON.
This may take up to 24 hours.
5. Verify that the Ready LED on the backup battery is ON.
6. Verify that the green Ready LED on the front of the base unit is on
steadily, and the red Alarm and orange Warning LEDs are not ON. The
green Ready LED on the front of the base unit may blink rapidly for a
maximum of 30 to 50 minutes.
7. Attach the front bezel.
8. The backup battery is not repairable. Recycle the removed backup
battery according to local ordinances.
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Replacing parts
Hitachi AMS 2000 Family Storage System Service Guide