Explorer QRZ-1 Replacement Battery 7.4V 2000mAh Li-ion

Explorer QRZ-1 — 7.4V Li-ion Replacement Battery

This is a 7.4V, 2000mAh (14.8Wh) Li-ion battery for the Explorer QRZ-1 two-way radio. It replaces the original pack on a like-for-like voltage and form factor basis. The cell stack dimensions — 103.80 x 53.30 x 21.90mm — match the OEM battery bay directly.

• QRZ-1 platform fit: The QRZ-1 runs a 7.4V nominal rail. This pack matches that rail and the physical connector orientation so the radio's power circuit sees no mismatch on boot.
• Bench tested on actual hardware: We cycled this pack through transmit loads typical of handheld radio use. The BMS held the output rail stable under sustained PTT draw and tripped correctly at the low-voltage cutoff threshold — no false lockout on first discharge.
• First insertion contact check: If the charger shows a fault LED on first insertion, remove the pack, wipe the contact pads with a dry cloth, and reseat it firmly. The QRZ-1 dock requires a clean contact cycle to complete the BMS handshake before charging begins.

Why the QRZ-1 bar indicator reads low on a new pack

Li-ion cells ship at storage voltage — typically 3.6–3.7V per cell, not full charge. The QRZ-1 reads voltage thresholds to display its bar indicator, so a new pack fresh out of packaging will often show one or two bars below full. This is not a capacity fault. Run one full charge cycle through the dock before treating the bar reading as accurate.

QRZ-1 drops TX power mid-shift after battery swap

Sustained RF transmission pulls significantly more current than standby or receive modes. If the cell impedance is elevated — common in a new pack that hasn't been cycled — voltage sags under that load and the radio's firmware steps down transmit power to stay within its operating window. This is not a radio fault. Charge the pack fully, run two or three complete discharge-recharge cycles, and the impedance will settle. Check that resting voltage sits at or above 8.0V before the next shift.