About this replacement
Motorola CP150 / CP200 Series — 7.4V Li-ion Replacement Battery (NNTN4496)
This 7.4V, 3350mAh lithium-ion pack replaces the NNTN4496 and its variants across the Motorola CP150, CP200, CP250, and PR400 portable two-way radios. It carries the same connector, BMS handshake profile, and voltage rail as the original Motorola pack. Drop it into the radio's battery bay and the charger dock treats it as a native cell.
- CP150 / CP200 / CP250 / PR400 platform fit: These four models share the same battery bay geometry, contact pin layout, and 7.4V power rail. One pack covers all four because Motorola standardised the BMS communication protocol across this CP/PR series generation.
- Bench tested on actual hardware: We cycled this pack in a CP200 chassis through three full charge–discharge passes. The BMS held the overcurrent cutoff threshold at the correct level during PTT transmit spikes, and the charger dock cleared its handshake on first insertion after contact wipe.
- First-insertion contact protocol for CP-series docks: If the dock LED flashes amber on first seating, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The CP-series dock runs a BMS handshake check before it begins charging — a residue film on the contacts is enough to fail that check.
Why the CP150 cuts out mid-transmission on a new NNTN4496 pack
New lithium-ion cells ship at storage voltage — typically 3.7V to 3.8V per cell, which puts a two-cell pack around 7.4V to 7.6V. The CP150's transmitter draws a sharp current spike the moment PTT is pressed. If the BMS hasn't completed its first full charge cycle, internal impedance is slightly elevated and that spike can trip the overcurrent threshold, cutting audio mid-transmission. Run a complete charge cycle before the first shift. After one full cycle, cell impedance drops and the BMS handles the PTT spike without interruption.
Bar indicator showing one fewer bar than expected after fitting a new pack
The CP-series radios use a simple voltage-threshold bar display — each bar represents a voltage band, not a percentage calculated by a fuel gauge chip. A new pack at storage voltage sits in the second-highest band, so the display shows three bars instead of four. This is not a fault with the battery. Seat the pack in the charger dock, run a full charge to 8.4V, and the display will read four bars from the next power-on.