About this replacement
Motorola APX7000 / APX6000 Series — 7.4V Li-ion Replacement Battery (NTN7034)
This 7.4V, 5000mAh (37Wh) Li-ion pack replaces the OEM battery in Motorola APX7000, APX7000XE P25, APX6000, and APX6000XE P25 portable radios, along with nine additional APX-platform models. It uses the same contact pinout and BMS communication protocol as the original Motorola pack. Replacement OEM part numbers covered include NTN7034, NNTN7034A/B, PMNN4487A, NNTN7038, NNTN8921 series, PMNN4486, NNTN7035, and PMMN4403.
- APX platform compatibility: The APX6000 and APX7000 families share a common battery bay geometry, contact strip layout, and BMS handshake voltage. Both run a 7.4V nominal rail, so a single pack covers both series without adapter or modification.
- Bench tested on actual hardware: We cycled this pack in an APX7000 dock and confirmed the BMS completed the full charge handshake without fault LED. Under simulated PTT transmit loads, the voltage rail held stable and the radio maintained full TX power throughout the draw cycle.
- First-insertion contact check: If the dock shows a fault LED on first seating, remove the pack and wipe the gold contact strip with a dry cloth. Reseat firmly. The APX platform requires a clean contact surface to complete the initial BMS negotiation before charging starts.
Why the APX7000 cuts out mid-transmission on a brand-new battery
New Li-ion cells ship at storage voltage — typically 3.6–3.7V per cell, not full charge. When the APX7000 transmits, it pulls a surge of current that the BMS may interpret as an overcurrent event if the cell voltage is already at the low end of the storage window. The BMS responds with a momentary cutoff, which kills the transmission. A full charge cycle before field use brings both cells to 4.2V each, giving the BMS enough headroom to absorb the TX current spike cleanly.
Bar indicator showing one fewer bar than expected after installing a new pack
The APX series uses voltage-threshold bar indicators, not a fuel-gauge chip. At storage voltage, the radio reads the pack as partially discharged and displays fewer bars accordingly. This is not a fault with the battery. Charge the pack fully in the dock until the charger LED goes solid green, then reinsert — the bar indicator will update to reflect the actual cell voltage of approximately 8.4V at full charge.