We lost power for 72 hrs once due to a blown transformer and we ran 13 setups on battery-op air pumps. They're a bit noisy, but they've worked fine for several years. We even "double-up" some setups to run on a single pump. We don't use airstones...just open-ended rigid airline. it works fine for surface turbulance and doesn't put as much strain on the pump diaphragm.
HTH