BAT0015 - On PE R620

We are constantly getting the following message:

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System Host Name: n-esx01.ianlets.com

Event Message: The PERC1 battery is low.

Date/Time: Mon, 16 Mar 2020 12:28:44 -0400

Severity: Warning

Detailed Description: System settings may be preserved if input power is not removed from the power supplies.

Recommended Action: Check the battery at the next service window.

Message ID: BAT0015

System Model: PowerEdge R620

Power State: ON

Operating System: VMware ESXi 5.5.0 build-2068190 System Location: Slot 1 (1 U)

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The message then switches to 

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System Host Name: n-esx01.ianlets.com

Event Message: The PERC1 battery is operating normally.

Date/Time: Mon, 16 Mar 2020 11:58:30 -0400

Severity: Informational

Detailed Description: None.

Recommended Action: No response action is required.

Message ID: BAT0016

System Model: PowerEdge R620

Power State: ON

Operating System: VMware ESXi 5.5.0 build-2068190 System Location: Slot 1 (1 U)

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This has been going back and forth for many days.  It seems like the best solution would be to change the battery in the RAID card.

Is this the right approach or could this be indicative of something more serious with the RAID card itself?

Please advise.

Thanks!