HPE Storageworks P4300 - Shutdown

[Kleefa]

Hello,

in our farm we have 2 SAN HP Storageworks P4300 G2 running clustered.

Both machines are connected to a UPS, the UPS batterey needs to be replaced that has been damaged for many days.

The volumes of all virtual servers reside on the two machines.

The question is: is it possible shutdown both SANs, replace the UPS battery and then turn on both SANs without losing data? Or is there any risk?

I state that I have backups of virtual machines but I would not obviously waste time rebuilding the structure.

Thanks for your suggestions !!