R520; Controller Event log: Battery charging was suspenden due to high battery Temperatur

I've got a Problem with an Power Edge R520 (Windows Server 2008):

This are the notice: Controller Event log: Battery charging was suspenden due to high battery Temperatur: Controller 0 (PERC H710P Mini)

and

Controller Event log: BBU disabled: changing WB virtual disks to WT. Forced WB VDs are not affected: Controller 0 (PERC H710P Mini)

Do we have to replace the battery? What is the type of the battery for the order?

Thank you for your Support.

Benjamin Krähemann Tyco