Product details:

Icecap Battery Backup Hook up your 12v-24v aquarium pump to the IceCap Battery Backup for continuous operation up to 35 hours after the loss of power. * In the event of a power outage, is your tank protected? This product is for any serious aquarium hobbyist that wants to protect his or her investment in the case of a power outage. In 4 - 6 hours of no flow within an aquarium can cause the death of valuable fish and corals. By adding an IceCap Battery Backup, your tanks flow will continue for up to ~35 hours after the power goes out (~17 hours for two pumps). Add a second battery backup to double the run time. Hook your Maxspect Gyre pump to the IceCap Interface module will automatically detect when main power is lost and will slow the gyre the 30% speed to extend the life of the battery. The module is backwards compatible and will run gyres already on the market. IDEAL BACK UP FOR MOST 12VOLT PUMPS Power Up to 2 Pumps On average 35hr run time* Connect 2 Battery Backups together and power one pump for double the backup time Ideal Back Up for most 12-24volt pumps Includes 3 sizes of adapter fittings *On average 50w at 30% power single pump/single powercell. The red LED will blink 2-5 times and repeat. 5 blinks 100% power - a reading of 12volts of power 4 blinks 80% power- a reading of 11-12 volts 3 blinks 60% power- a reading of 10-11 volts 2 blinks 40% power- a reading of 9-10 volts 1 blink 20% power- Less than 9 volts and the pump will soon quit working.