Radioddity GM-30 Compatible Battery UV-5X 7.4V 2000mAh

Radioddity UV-5X / G11S / MU-5 / TD-H5 — 7.4V Li-ion Replacement Battery (GM-30)

The GM-30 is a 7.4V, 2000mAh Li-ion pack that replaces the factory battery on the Radioddity UV-5X, G11S, MU-5, and TD-H5 handheld transceivers. These radios share the same battery bay geometry and contact layout, so one pack covers the full compatibility group. Capacity figure is taken directly from product specifications — 14.8Wh total energy.

• UV-5X / G11S / MU-5 / TD-H5 platform fit: These four models run off the same 7.4V nominal rail, share an identical battery bay and contact strip layout, and use the same BMS handshake protocol — which is why a single GM-30 pack covers all of them without modification.
• Bench tested on actual hardware: We cycled this pack through transmit loads on the UV-5X platform. The BMS handled the current spike at PTT press without tripping into overcurrent lockout, and the protection circuit held the discharge floor at the expected low-voltage cutoff threshold.
• First insertion on the charging dock: If the dock LED flashes a fault on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly — the UV-5X dock requires a clean contact cycle to register the new BMS before it begins a charge sequence.

Why the UV-5X drops to reduced TX power mid-shift on a new GM-30

A new Li-ion cell ships at storage voltage — typically 3.6–3.75V per cell, not full charge. Under sustained RF output, that lower starting voltage sags further under transmit load, and the radio's internal power management steps down TX output to protect the finals. This is not a faulty pack. A full charge cycle before extended use brings both cells to 4.2V each, which gives the radio the headroom it needs to hold rated output through a full shift without stepping down.

Bar indicator showing one fewer bar than expected after inserting the GM-30

The UV-5X reads voltage-threshold bars — it checks pack voltage and maps it to a bar count. A new cell at storage voltage sits below the top threshold, so the radio displays one bar fewer than full even with a brand-new pack installed. This is not a capacity defect. Charge the pack to 8.4V (4.2V per cell) on the dock until the LED goes green, then reinsert — the indicator will step up to the correct bar count.