Rechargeable Battery Powered Diffuser Battery diffusers have two settings: 50% and 100% - At 100% power, oil lasts 18+ hours - At 50% power, oil lasts 36+ hours Mains Powered Diffuser Mains powered diffusers have five power settings: 100%/75%/50%/25%/10%  - At 100% power, oil lasts 18+ hours - At 75% power, oil lasts 24+ hours - At 50% power, oil lasts 36+ hours - At 25% power, oil lasts 72+ hours+ - At 10% power, oil lasts 180+ hours
*Oil consumption figures are based on tests with a 15ml oil bottle. Oil consumption times will vary and depend on the diffuser type and particular oil used. Diffusion times are only applicable to our own machines.