Replace your failing Aeroqual handheld battery or buy a spare! Lithium (blue) battery pack for use in the Series 200, 300 and 500 Portable Monitors. Will provide over 8 hours of battery life and a 2 hour charging time. NIMH (green) Compatible with our older Series 200, 300 and 500 portable monitors. Will provide over 6 hours of battery life and a 15 hour charge time.

Please Note: There used to be two options for an Aeroqual Replacement Battery. There was a green battery (R31) that has been discontinued, if you had the green battery, the blue (R36) battery will not work in your Aeroqual monitor.