Experience the convenient luxury of recharging your SimplyGo battery without plugging your concentrator in to the AC or DC power supply with the Respironics SimplyGo External Battery Charger. With the added convenience of being able to recharge your battery without plugging your concentrator in, you are able to get more accomplished throughout your day. The single-bay external battery charger is equipped with an 110v power cord allowing you to recharge your battery wherever you're staying. With a quick recharge time of 2 – 3 hours, you can run some errands and come back to a fully charged battery to keep your day going. Along with recharging your battery, this external battery charger has the capability of recalibrating your battery. Calibrating your battery will reset the lithium-ion cells to ensure it holds as much of a charge as possible, with the calibration process taking up to 8 hours per battery. The LED indication system shows you what stage your battery is at during the charging or calibrating process—flashing green for charging, solid green for fully charged, flashing blue for recalibrating, solid blue for recalibration complete, and solid red indicating the battery needs replacement. The charger weighs 2 pounds and measures 3.5" W x 7" L x 2" H.