This Battery Pack is designed for use with the Devilbiss Traveler Compressor Nebulizer. Small, Long Lasting Battery The Traveler battery is small, easy to attach and weighs .7 pounds. A one-year warranty and 45 minute life makes it perfect for those on the go! NOTE – For a new rechargeable battery, the first charge will take at least 24 hours. NOTE – Battery will not charge while device is in use. Charging the battery continually between treatments is recommended.