Motorola P200 NTN4824A Replacement Battery 9.6V 2500mAh

Motorola P200 / HT600 / MTX800 Series — 9.6V Ni-MH Replacement Battery (NTN4824A)

This is a 9.6V, 2500mAh Ni-MH battery for the Motorola P200, P210, HT600, and MTX800 series portable two-way radios. It replaces OEM part numbers NTN4824A, NTN5049A, NTN5414, NTN5447A, NTN5447B, NTN5521A, and NTN5531. The pack slots into the same battery bay as the original and uses the same contact layout.

• P200 / HT600 / MTX800 platform fit: These models share a common 9.6V Ni-MH battery architecture with identical connector geometry and BMS handshake requirements. One pack covers the full range without adapters or wiring changes.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on the P200 platform. The BMS handled transmit-current spikes without tripping, and the voltage held steady across the discharge curve.
• First insertion contact check: 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 Motorola platform requires a clean contact cycle to complete the BMS handshake before charging begins.

Why the P200 cuts out mid-transmission on a new battery

Pressing PTT draws a sharp current spike — often 1.5A to 2A — as the transmitter ramps to full RF output. A new Ni-MH cell at storage voltage (typically 1.0–1.1V per cell) has higher internal impedance than a fully conditioned pack. Under that spike, voltage sags across the cell stack, and the radio's low-voltage cutoff trips before the transmission completes. Run two or three full charge-discharge cycles to condition the cells and drop impedance before heavy transmit use.

Bar indicator showing one fewer bar than expected on a fresh pack

The P200 and HT600 use a simple voltage-threshold bar indicator — each bar maps to a fixed voltage band across the 9.6V stack. A new pack shipped at storage voltage reads lower than a freshly charged pack, so the indicator lands one bar short on first power-up. This is not a fault with the cell capacity. Charge the pack to full before reading the indicator — at full charge you should see the indicator sit at the top threshold band.