MD3620fc replacing controller battery

I have an MD3620fc showing battery status Not Available and I think I should replace it.

I have a replacement spare battery, but I'm not quite shure if just setting the controller offline will do the failover correctly of all Virtual Disks to the alternate controller, or if it must be done the change ownership manually. Anyway, is there any risk of I/O dusruption? Is it safe?

All Virtual Disks is showing Write cache: Enabled (currently suspended).

Battery status: Not Available
Location: RAID Controller Module 0
Age: 1,713 days
Days until replacement: Not Available
Last learn cycle: February 28, 2020
Next learn cycle: April 24, 2020
Weeks between learn cycles: 8
Part number: PN D668J
Serial number: SN 7578047S0356
Vendor: VN DELL
Date of manufacture: July 1, 2014

Battery status: Optimal
Location: RAID Controller Module 1
Age: 1,713 days
Days until replacement: Not applicable
Last learn cycle: February 28, 2020
Next learn cycle: April 24, 2020
Weeks between learn cycles: 8
Part number: PN D668J
Serial number: SN 7578047S0265
Vendor: VN DELL
Date of manufacture: July 1, 2014

 

 

I'd be glad for any help.

Thanks

Márcio