Oxymed Portable Battery Powered Oxygen Concentrator Oxymed Battery Powered Oxygen Concentrator is a Medical Grade Portable Oxygen Concentrator with battery backup up to 5.4 hours and purity of 90 +/- 3%. The product is FDA approved and CE certified. The product comes with a 3 warranty on the unit and 1 year on battery and sieve beds which is the highest among peers. The product is FAA approved and can be carried on flight