Motorola DP3000e Compatible Battery 7.4V 1600mAh PMNN4440

Motorola DP3000e / DP3441e / DP3661 Series — 7.4V Li-ion Replacement Battery (PMNN4440)

This is a 7.4V 1600mAh Li-ion battery for Motorola's DP3000e, DP3441, DP3441e, DP3661, and related professional digital portables. It matches OEM part numbers PMNN4440, PMNN4440AR, PMNN4502A, and PMNN4511A. Physical dimensions are 95.80 × 60.60 × 14.60mm — check your existing pack before ordering if you're unsure of your variant.

• DP3000e / DP3441e / DP3661 platform fit: These models share a common 7.4V battery bay, connector pinout, and BMS handshake protocol across the DP3000 and DP3600 families. A single cell format serves the whole line, which is why multiple OEM part numbers map to the same physical pack.
• Bench tested on actual hardware: We ran this pack through a full charge cycle and monitored BMS behaviour under simulated PTT load. The protection circuit handled transmit current spikes without tripping, and cell voltage held within the expected window across the charge curve.
• First insertion into the charger dock: If the dock LED shows a fault on first insertion, remove the battery and wipe the gold contact strip with a dry cloth before reseating. The DP3000e platform requires a clean contact cycle to complete the BMS handshake before the charger accepts the pack.

Why the DP3000e cuts out mid-transmission on a new battery

Pressing PTT draws a sharp current spike — often 1.5A to 2A above standby draw — in the first milliseconds of transmission. If the battery's BMS trips on that spike, the radio cuts audio mid-transmission and may restart the RF module. This is not a radio fault. New cells delivered at storage voltage (around 3.7V per cell) have slightly higher internal impedance, which makes the voltage sag sharper under that initial load. One or two full charge-discharge cycles bring cell impedance down and eliminate the cutout.

Bar indicator showing one fewer bar than expected after a full charge

The DP3000e uses a simple voltage-threshold bar indicator — it reads pack voltage and maps it to bars, with no capacity tracking. A new cell fresh from storage sits at roughly 3.7V per cell, and even after a first charge cycle the resting voltage may settle slightly below the threshold the radio uses for a full-bar reading. This is normal and corrects itself after the first full cycle. If bars remain low after two full cycles, check that the dock contacts are clean and that the charge LED goes green before removing the pack — pulling the battery while still in bulk charge phase will leave the cell undercharged regardless of how long it sat in the dock.