About this replacement
EADS G2 Series — 4.8V Ni-MH Replacement Battery (BLN-4)
This 4.8V, 2000mAh Ni-MH battery replaces the OEM BLN-4 and BLN-5i packs in EADS G2, G2-T-04P, G2-T-04P/N, HH2G, and related handheld two-way radios. It matches the original connector layout and BMS handshake protocol used across the G2 platform. Capacity is 2000mAh (9.6Wh) — identical to the factory specification.
- G2 platform compatibility: The G2 series and its variants share the same 4.8V voltage rail, physical connector, and BMS communication sequence. A single pack covers the full range because the charging dock negotiates with the pack over the same contact strip regardless of the specific variant suffix.
- Bench tested on actual hardware: We cycled this pack through transmit loads on the G2 platform and confirmed the BMS holds voltage through sustained PTT press without tripping overcurrent protection. The pack accepted a full charge cycle without fault LED on the dock.
- First insertion contact check: If the dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The G2 dock requires a clean contact cycle to complete the BMS handshake before charging begins — this is not a defect.
Why the G2 drops to reduced TX power mid-shift on an ageing Ni-MH pack
Ni-MH cells develop internal impedance over repeated cycles. Under the current spike of a sustained PTT press, a high-impedance cell sags below the radio's minimum operating voltage threshold. The G2 firmware interprets this as a low-battery condition and steps down transmit power to protect the RF stage. Replacing the pack restores the voltage headroom the radio needs to sustain full TX output through a shift.
Bar indicator showing one fewer bar than expected after inserting a new pack
New Ni-MH cells ship at storage voltage, not full charge voltage — typically 1.2V per cell, which reads lower than a freshly charged cell at 1.4V. The G2 bar indicator uses simple voltage thresholds, so a new pack at storage voltage will display one bar fewer than its actual capacity warrants. Run a full charge cycle before judging the pack's state. After one complete charge, the bar indicator will reflect the true cell voltage and the reading will correct itself.