Do you have more than one battery that you need to ensure is fully charged for your Respironics SimplyGo Mini portable oxygen concentrator? Stop having to cumbersomely wait for each battery to individually charge through the use of the AC or DC power supplies, and instead make the upgrade to the time saving Respironics SimplyGo Mini External Battery Charger. The external battery charger is a must-have accessory when you need the ability to charge a second battery on the side while still using your Respironics SimplyGo Mini to provide your prescribed amount of medical grade oxygen. The external battery charger is a single-bay charger that provides you with the ability to recharge both the standard and extended SimplyGo Mini batteries without plugging your concentrator into the AC or DC power supplies. When it comes to recharging your SimplyGo Mini batteries, the external battery charger is the fastest and most efficient option to choose from. Compared to the AC and DC power supplies, the external charger is not responsible for powering your concentrator at the same time, resulting in a noticeable difference in how fast your battery will recharge. The standard battery takes 4 hours to fully recharge, while the extended battery takes 6 hours. The charger weighs only 2 pounds and plugs into any wall outlet with its 110v power cord.