Fully battery operated Gas Leak Detectors are not available anywhere in the world. Reason being the current consumed by such device/ detector/ sensor would drain the standard battery within 6-7 days. Hence it’s not practical to keep replacing the batteries after every 7 days. We do not supply battery operated gas leak detector. However we do have model with rechargeable battery backup. In case of power failure this detector with rechargeable battery will switch to battery mode.