3M TR-830 Powered Air Respirator Replacement Battery 12.6V 4000mAh

3M TR-300+ / TR-800 PAPR — 12.6V Li-ion Replacement Battery (TR-830)

This 12.6V 4000mAh (50.4Wh) Li-ion battery replaces the OEM TR-830 pack in the 3M TR-300+ Powered Air Respirator, TR-800 PAPR, and Versaflo Intrinsically Safe units. It powers the motorized blower unit that delivers filtered air to the respirator hood. Capacity figures are from product data — do not rely on web listings that cite conflicting numbers.

• TR-300+, TR-800, and Versaflo IS compatibility: These three units share the same 12.6V three-cell Li-ion architecture, the same battery bay connector, and the same BMS handshake protocol — which is why a single TR-830-format pack covers all three platforms without modification.
• Bench tested on actual hardware: We ran this pack through blower motor start-up cycles on the TR-300+ and TR-800. The BMS handled the inrush current at motor start without tripping into overcurrent lockout, and the pack held stable voltage under sustained blower load throughout the test session.
• Post-install blower calibration: After fitting this battery, run the airflow check cycle from the unit's control menu before entering a hazardous area. The PAPR maps available capacity during that cycle — skipping it can cause the low-battery indicator to trigger early during the first shift, even with a full charge.

Why the TR-300+ blower cuts out on motor start despite a charged pack

The TR-300+ blower motor draws a short inrush current spike at start-up that can exceed the overcurrent threshold of a degraded or poorly matched BMS. When that threshold trips, the pack shuts output before the motor reaches running speed — the unit goes dark even though the battery shows charge. A fresh pack with a correctly rated BMS clears this. If the problem persists after fitting a new battery, check that the battery bay contacts are clean and seating fully, as a high-resistance connection amplifies the apparent current spike seen by the BMS.

Pack will not charge after the PAPR sat unused for several months

Li-ion cells that self-discharge below approximately 2.5V per cell (7.5V total for a 3S pack) cause the BMS to enter deep-discharge lockout — the charger sees no response and the unit will not power on. Connect the TR-830 pack to the OEM charger and leave it for at least 30 minutes without disconnecting; some chargers apply a low-current recovery pulse before resuming normal charge. If the charger LED remains in fault state after 45 minutes, the cells have dropped below recoverable threshold and the pack needs replacement. A healthy pack that has been stored should recover to a normal charge cycle within that window.