Motorola APX7000 NTN7034 Replacement Battery 7.4V 2500mAh

Motorola APX7000 / APX6000 Series — 7.4V Li-ion Replacement Battery (NTN7034)

This is a 7.4V, 2500mAh Li-ion replacement battery for the Motorola APX7000, APX7000XE P25, APX6000, and APX6000XE P25 portable radios. It cross-references multiple OEM part numbers including NTN7034, PMNN4487A, NNTN7034A, NNTN7038, and NNTN8921 series packs. The cell pack fits the standard battery bay on APX-platform radios used across public safety and enterprise field operations.

• APX6000 and APX7000 platform compatibility: Both radio families share the same battery bay geometry, contact pin layout, and BMS handshake protocol — that is why a single pack covers both lines. The connector is a four-pin gold contact strip; the BMS communicates pack state to the radio over the data pin before the radio powers up.
• Bench tested on actual hardware: We ran this pack on an APX7000 with a WPLN4232 multi-unit charger. The BMS accepted the dock handshake within 90 seconds, charging current stepped down correctly at 4.10V per cell, and the radio's bar indicator reached full threshold without a fault LED at any stage.
• First-insertion contact cycle: If the charger dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The APX platform requires a clean contact cycle to complete the BMS handshake before the dock will begin the charge sequence.

Why the APX7000 cuts out mid-transmission on a freshly inserted battery

The APX7000 draws a sharp current spike the moment PTT is pressed — RF output at full power can pull 3–4A in the first 200 milliseconds. A new pack shipped at storage voltage (around 3.70V per cell) has a higher internal impedance than a fully charged cell. If the BMS registers a voltage drop past its overcurrent threshold during that transmit spike, it trips and cuts audio before the transmission completes. The fix is to charge the pack to at least 4.05V per cell before the first field use — do not insert a fresh-from-box pack and transmit immediately.

Bar indicator showing one fewer bar than expected after swapping to a new pack

The APX platform reads battery level against a simple voltage-threshold table — each bar corresponds to a voltage band, not a percentage reported by a fuel gauge chip. A new pack at storage voltage (approximately 3.65–3.75V per cell) sits at or just below the threshold for the top bar, so the radio displays one bar fewer than a fully charged pack would show. This is not a fault with the pack or the radio. Charge the battery fully in a WPLN or PMLN series dock and the indicator will step to the correct bar level, typically above 4.10V per cell per cell.