NVRAM Battery Warning on NetApp Data ONTAP

It looks to me we have to power up our lab gears for longer time. Otherwise, this warning message will come back again and again! :)

WARNING:  The battery is unfit to retain data during a power
          outage.  This is likely because the battery is
          discharged but could be due to other temporary
          conditions.
          When the battery is ready, the boot process will
          complete and services will be engaged.
          To override this delay, press 'c' followed by 'Enter'
c

CAUTION: Using this appliance without NVRAM
         battery backup coupled with a power
         failure condition CAN CAUSE DATA LOSS.
Are you sure you want to continue (y or n)? y
Delay for charging canceled by user. Charger is ON