About this replacement
Motorola XPR7350 / XPR3000 Series — 7.4V Li-ion Replacement Battery (PMNN4409)
This 7.4V 2600mAh Li-ion battery replaces the original PMNN4409 and fits the Motorola XPR7350, XPR3300, XPR3500, XPR3000, and over 57 compatible models in the MOTOTRBO portable radio lineup. It is a direct voltage and form-factor match for the XPR series battery bay. Capacity figures come from the product data, not third-party estimates.
- XPR and XPR3000 series compatibility: The XPR7350, XPR3000, XPR3300, and XPR3500 all share the same 7.4V two-cell Li-ion architecture, battery bay dimensions, and connector pinout. One pack covers the full MOTOTRBO portable tier without modification.
- Bench tested on actual hardware: We ran this pack through charge, transmit-load cycling, and BMS handshake verification on an XPR7350 dock. The BMS accepted the charging cycle cleanly, and overcurrent protection tripped correctly under a simulated high-draw PTT event.
- First insertion on a Motorola IMPRES or standard dock: If the dock shows a fault LED on first insertion, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly. The MOTOTRBO platform requires a clean contact cycle to complete the BMS handshake before charging begins — a single reseating clears this in most cases.
Why the XPR7350 cuts out mid-transmission on a new battery
PTT current draw on the XPR7350 spikes sharply the moment the transmitter fires — this is a normal characteristic of the RF output stage. If the replacement pack's BMS is configured with a tight overcurrent threshold, that spike can trip the protection circuit and kill the transmission mid-key. The radio resets quickly, but the user experiences it as a dropout. This is not a cell defect; it is a BMS calibration issue at the boundary of the transmit current envelope. If dropouts persist after a full charge cycle, verify the dock completed a proper charge termination before field use.
Bar indicator showing one fewer bar than expected on a new PMNN4409
New Li-ion cells ship at storage voltage — typically around 3.7–3.8V per cell — not at full charge. The XPR series uses a voltage-threshold bar indicator, so a pack at storage voltage will display one or two bars even though the cells are healthy. This is not a capacity fault. Place the battery in a compatible dock and allow a full charge cycle to complete before reading the indicator. After a full charge, the bar indicator should reflect the 7.4V nominal pack voltage correctly.