Guide · Air pumps and aeration
Battery-backup air pumps
What a battery-backup air pump does in an outage, how to read a maker's runtime claim and Power Save mode, and how to look after the lithium battery.
Short answer
A battery-backup air pump runs from the wall and switches to a built-in battery when the power goes out, so air keeps moving for a while. How long is a maker claim: the only documented example we found, Aquarium Co-Op's pump, states about 20 hours continuous or 40 hours in Power Save mode.[1] No independent runtime test exists, and only the air keeps going: the filter, lights and everything else on mains still stop.
What it covers, and what it doesn't
Aquarium Co-Op says its air pump switches automatically to its built-in lithium-ion battery when power is lost.[1] That keeps bubbles, and the surface movement they cause, going during an outage. Surface movement is how bubbles mainly help oxygen get into the water.[2]
It does not keep anything else running. A mains filter stops, and so does anything else plugged into the wall. A battery-backup pump is one piece of an outage plan, not the whole plan; the outage guide covers the rest.
Reading a runtime claim
Aquarium Co-Op's figures, from its product page:[1]
| Mode | Units sold from August 1, 2024 | Units sold before |
|---|---|---|
| Continuous | About 20 hours | 8 hours |
| Power Save (15 s on, 15 s off) | About 40 hours | 16 hours |
Three things to note:
- These are the maker's figures. We found no independent runtime measurement, and the maker does not say at what flow setting or battery age they apply.
- Check which version you have. The maker notes that the printed manual still shows the older 8 and 16 hour figures.[1]
- Runtime is not a livestock promise. Neither the maker nor any source we read says how long fish are fine on battery air. Treat runtime as the time you have to restore power or get someone to the tank.
With 15 seconds on and 15 seconds off, Power Save runs the air half the time to stretch the battery. Whether intermittent air is enough for a given tank is not something any source answers.
Power and setup
The Aquarium Co-Op pump runs on a 5 V USB-C supply; the maker lists 1.1 L/min for the single-outlet model and 1.6 L/min for the dual.[1] It has five adjustable flow levels and a power cord over 11 feet long with a USB connector that can also run from a USB power bank.[1] A charged power bank is a second backup if an outage outlasts the internal battery.
Place it like any air pump: above the water line, or below it only with a check valve, and never submerged.[1] The maker also says it is not available for shipping to Hawaii or Alaska.[1]
Looking after the lithium battery
The battery inside is a lithium-ion battery. Health Canada's general advice on lithium-ion batteries applies:[3]
- Do not use a battery, or a device, that is swollen, dented or otherwise damaged.
- Charge it as the maker instructs, away from soft surfaces such as a couch or bed.
- Use the original charger, or a replacement with a CSA, cUL or cETL mark.
In US transport, lithium batteries are regulated as hazardous materials and must have passed the UN 38.3 design tests.[4] That is a shipping rule, not a product-safety certification, so it says nothing about how the pump itself is built.
Next
Questions
How long will a battery-backup air pump run?
Only the maker's figure is available. Aquarium Co-Op states about 20 hours continuous and 40 hours in Power Save for units sold from August 1, 2024, and 8 and 16 hours for earlier units; no independent runtime measurement was found.[1]
Does a battery-backup pump switch over by itself?
Aquarium Co-Op says its pump switches automatically to its built-in lithium-ion battery when power is lost.[1]
What is Power Save mode?
On Aquarium Co-Op's pump, Power Save cycles the air 15 seconds on and 15 seconds off to stretch the battery, per the maker.[1]
Can I run a battery air pump from a power bank?
Aquarium Co-Op says its pump's cord, over 11 feet long, ends in a USB connector that can also run from a USB power bank.[1]
Does a battery-backup air pump keep fish safe in an outage?
No maker promises that, and we found no source that does. It keeps air moving for a limited time; the filter, heater and lights still stop.