Thank you for your interest in Drs. Foster and Smith. We do have two battery back up air pumps that might interest you. First we have the Azoo Battery Air Pump Battery Air Pump, CD-96016 which is designed for smaller aquariums and less time without power. We also have the Azoo Battery Backup Pump Battery Backup, CD-11939 which is a versatile air pump for continuous use or 10 - 20 hours of battery operation and has two air hose lines.