RAID Controller BBU (Battery Backup Unit) is an advanced piece of hardware that provides a temporary power supply to the cache of the RAID controller to ensure no loss of data stored in the cache happens due to an unexpected power failure. RAID Controller BBUs have evolved from standard nickel-metal hydride batteries to high-end Lithium-ion batteries and highly efficient supercapacitors with a Flash Back unit that stores data using non-volatile flash memory temporarily during any power outage. Such BBUs are crucial when dealing with heavy-duty operations in databases, banks, or cloud storage systems, as any power outage for even milliseconds can lead to disastrous consequences in terms of data corruption and damage to the entire file system