About this replacement
Motorola XPR7350 / XPR3000 Series — 7.4V Li-ion Replacement Battery (PMNN4409)
This 7.4V, 2450mAh lithium-ion battery replaces the PMNN4409 and fits the Motorola XPR7350, XPR3000, XPR3500, and XPR3300 series portable radios. It slots into the same battery compartment and connects via the same four-contact interface as the original pack. Voltage and capacity match OEM spec exactly — no firmware flags, no forced low-power mode.
- XPR3000 / XPR7000 platform compatibility: These radios share a common battery form factor and BMS handshake protocol across the XPR3300, XPR3500, XPR7350, and related variants. The shared connector pinout and voltage rail mean one pack services the full lineup without adapter or modification.
- Bench tested on actual hardware: We cycled this pack through transmit bursts on an XPR7350 and monitored BMS response under sustained PTT loads. The protection circuit held steady through repeated transmit spikes without triggering overcurrent cutoff.
- First-insertion contact reset on Motorola dock chargers: If the IMPRES or standard Motorola dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The dock requires a clean contact cycle to complete the BMS handshake before charging begins — this is not a defective battery.
Why the XPR7350 cuts out mid-transmission on a freshly inserted pack
A new cell ships at storage voltage — typically around 3.6V to 3.7V per cell, not the 4.2V full-charge peak. When you press PTT, the radio draws a sharp current spike to power the RF amplifier. At storage voltage, the BMS may read that spike as an overcurrent condition and trip the protection circuit before the radio completes the transmission. The fix is straightforward: charge the pack fully before field use. A full charge brings each cell to 4.2V and gives the BMS the headroom it needs to absorb the transmit surge without cutting off.
Bar indicator showing one fewer bar than expected after swap
The XPR series reads battery level from voltage thresholds — not a fuel gauge chip. A new pack at storage voltage reads lower on that scale than a fully charged one, so the radio may show two bars instead of four immediately after insertion. This is not a capacity fault or a compatibility issue. Put the pack on the charger until the dock shows a solid green, then reinsert — the bar indicator will reflect actual charge state and display correctly at 7.4V full charge.