In an aquarium with no flow, fish and coral can begin to die in as little as 4 to 10 hours. The Battery Backup is reef tank insurance in an aluminum housing.
By adding the Battery Backup, your tank is insulated from power interruptions, helping protect your tank inhabitants.
Regarding shipping, for me, I live in Argentina, it was excellent. Regarding the product, I know it and it is spectacular how it behaves in the light cuts. I recommend this company 100%. Best regards