For added convenience and portability, the Lumiscope 6700 Portable Ultrasonic nebulizer offers an optional NiMH rechargeable battery for the power input. The reusable battery offers approximately 80 minutes of operation and takes approximately 5-6 hours to charge after first-time charge of 8 hours.
The original battery I received with the nebulizer had to be charged with the nebulizer attached. I like the new one as I can charge it independently.
I am extremely pleased with this purchase. It's quick, quiet and it works. I also purchased the car adapter and portable battery and have had no issues with any of the items. My only "concern," is that it requires approximately 2 tablespoons of water to use. However, this "concern" isn't a deal-breaker.