Here is a summary of the portable oxygen concentrators that weigh over ten pounds.
This powerful pulse dose and continuous flow portable oxygen concentrator weighs exactly 10 lbs with the battery inside. It's easy to carry via the carry bag, but you can also roll it around with the lightweight and easy to maneuver mobile cart. The settings range from 1 to 6 in half increments for pulse dose oxygen, and the continuous flow settings go from 1 to 1 in 0.5 increments as well.
The versatile EverGo is quiet, low maintenance and extremely user friendly. The rechargeable batter will last around 3 hours on the pulse dose setting of 2, and 1.6 hours on the lowest continuous flow setting. You can depend on getting an average oxygen purity of 93% at all times on all settings. You can easily charge it with the AC or DC adapters, or charge a battery with the Respirionics External Battery Charger.