Motorola XPR7350 7.4V 5000mAh Compatible Battery PMNN4409

Motorola XPR7350 / XPR3000 Series — 7.4V Li-ion Replacement Battery (PMNN4409)

This is a 7.4V, 5000mAh (37Wh) Li-ion battery for the Motorola XPR7350, XPR3000, XPR3500, XPR3300, and over 40 compatible models in the XPR and XPR3 platform. It replaces OEM part numbers including PMNN4409, PMNN4412, PMNN4448, PMNN4490, PMNN4491, PMNN4543, PMNN4544, and related variants. The pack ships at storage voltage — not full charge — which is normal for Li-ion transport.

• XPR platform compatibility: The XPR7350, XPR3000, XPR3500, and XPR3300 all share the same 7.4V battery bay, contact pin layout, and BMS handshake protocol. Motorola issued multiple OEM part numbers across production runs — PMNN4409, PMNN4412, PMNN4490, PMNN4543, and others — but the underlying cell format and BMS communication spec did not change. This pack is electrically interchangeable across those variants.
• Bench tested on actual hardware: We ran this pack on an XPR7350 dock and cycled it through transmit loads. The BMS accepted the dock handshake on first insertion with clean contacts, held voltage above the radio's low-battery threshold under sustained PTT loads, and tripped overcurrent protection correctly on a simulated fault — then reset cleanly after load removal.
• First insertion on the IMPRES dock: If you use a Motorola IMPRES charger, do not expect a standard charge cycle on the first insertion. IMPRES reads the battery's internal data before beginning charge. Wipe the gold contact strip with a dry cloth before seating the pack — any residue on those contacts can cause the dock to loop the handshake and show a fault LED instead of beginning charge.

Why the XPR7350 drops to reduced TX power mid-shift on a new battery

The XPR7350 monitors pack voltage continuously and steps down transmit power when voltage sags below its internal threshold — typically around 6.8V under load. A new pack at storage voltage starts around 7.0–7.2V, which leaves little headroom under sustained RF output before the radio throttles back. This is not a fault with the battery. Run a full charge cycle before the first operational shift, and the pack's resting voltage will be above 8.0V, giving the radio the headroom it needs to hold full TX power through extended use.

Dock fault LED that won't clear after inserting the new pack

A persistent fault LED on the Motorola charger dock usually means the dock did not complete the BMS handshake — not that the battery is defective. This happens when the gold contact strip on the battery has any film, oxidation, or fingerprint residue breaking the electrical path. Remove the pack, wipe all five contact points with a dry lint-free cloth, then reseat it firmly until you feel the latch click. If the fault LED still does not clear after reseating, check that the pack's resting voltage is above 5.5V using a multimeter — a pack that shipped deeply discharged may need a compatible external charger to bring it above the dock's acceptance threshold before the internal charger will engage.