Patent ID: 8603228

Claim:
An oxygen concentrator system, comprising: at least two canisters; gas separation adsorbent disposed in at least two canisters, wherein the gas separation adsorbent separates at least some nitrogen from air in the canister to produce oxygen enriched gas; a compression system coupled to at least one canister, wherein the compression system compresses air during operation; an internal power supply coupled to the compression system, the internal power supply providing power to operate at least the compression system during use; wherein the internal power supply comprises an internal power supply input port; and an auxiliary power supply removably coupleable to the internal power supply input port; the auxiliary power supply comprising: an auxiliary power supply body; one or more battery cells disposed in the auxiliary power supply body; a control circuit coupled to one or more of the battery cells, disposed in the auxiliary power supply body; an auxiliary power supply input port coupled to the control circuit; and an auxiliary power supply output connector coupled to the control circuit; wherein the auxiliary power supply output connector is used to removably couple the auxiliary power supply to the internal power supply input port during use; wherein the control circuit directs flow of current from the one or more battery cells to power the oxygen concentrator system when the auxiliary power supply output connector is coupled to the internal power supply input port.