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EverGo Batteries will recharge in the concentrator whenever it is connected to AC or DC power. In addition batteries can be recharged outside of the concentrator using the Charger/Recalibrator which is sold separately on this site.
USAGE: Each battery includes an LED "fuel gauge" to help determine current battery charge. When inserted into the concentrator the Respironics logo on the battery should face the INSIDE of the device.