This Battery Backup keeps two Vortech pumps running for hours and hours in the event of a power outage. I use these on my own reef to tide everything over and provide circulation, even if the power outage occurs while I'm asleep.
Comes with the self-contained battery, power cord and two fused leads to connect to EcoSmart drivers.
If used with a Vetra S1, M1 or L1 pump, you must purchase a Booster cable as well. Sold separately.