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How long should be waited before removing E2800 controller's battery?

Last Updated:

Applies to

  • E-series
  • E2800


  • There is no fixed time since it depends on how long the controller uses the battery but it is supposed to take several seconds or several minutes.
  • The green LED inside the controller (between the battery and the DIMMs) is the Internal Cache Active LED. If it is on, there is data in the controller cache. It requires waiting for the LED to go off (indicates data in the cache has been flushed to the cache backup device) before removing the battery.

NOTE: If some issue exists in the cache backup device, the Internal Cache Active LED might keep on lighting longer than 30 minutes because the data cannot be flushed into the cache backup device normally.

Additional Information

Step 2b: Remove battery (duplex)

2. Confirm that the green LED inside the controller (between the battery and the DIMMs) is off.

     If this green LED is on, the controller is still using battery power. You must wait for this LED to go off before removing any components.

28 dwg e2800 internal cache active led maint e2800

(1) Internal Cache Active LED

(2) Battery

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