Description Extend the operating hours of your 3M™ Adflo™ Powered Air Respirator with 3M™ Adflo™ Li-ion Battery Heavy-Duty, 837631. Our heavy-duty Li-ion battery fully charges in about 5.5 hours depending on residual capacity. When new, the fully-charged battery provides between 10 and 13 hours of operating time when the respirator is used with a new particle filter and a standard airflow setting. Compact and lightweight for optimum user comfort during a full shift. Speedglas ref. 837631
