Midland GXT200 Replacement Battery BATT4R 4.8V 700mAh

Midland GXT200 Series — 4.8V Ni-MH Replacement Battery (BATT4R)

This 4.8V, 700mAh Ni-MH pack replaces the BATT4R battery in the Midland GXT200, GXT250, G223, and G226 two-way radios. It slots directly into the same battery compartment and connects to the same contact pins as the original. Voltage and capacity match the factory spec exactly — no modifications needed.

• GXT200 and GXT250 platform fit: These models share the same battery bay geometry, contact layout, and 4.8V supply rail. The G223 and G226 use the same form factor. One pack covers all of them because the voltage threshold for low-battery cutoff is identical across the range.
• Bench tested on actual hardware: We cycled this pack through full charge and transmit load on a GXT200 unit. The BMS held the voltage rail steady under PTT key-down and released cleanly at the low-voltage cutoff threshold — no premature shutdown, no erratic bar drops during the cycle.
• Ni-MH contact cleaning before first charge: Ni-MH cells ship at partial charge and can cause a false fault reading on the GXT charger cradle if the contacts have any surface oxidation. Wipe the three contact pads on the battery with a dry cloth before first insertion. This clears the contact resistance that prevents the cradle from recognising the pack and starting the charge cycle.

Why the GXT200 cuts out mid-transmission on a new Ni-MH pack

Pressing PTT on the GXT200 pulls a short current spike as the transmitter powers up. A new Ni-MH cell at storage voltage — typically around 4.6V for a 4-cell pack — sits close to the radio's low-voltage cutoff threshold. That spike briefly drops the rail below the cutoff point, and the radio interprets it as a depleted battery and shuts the transmitter down. This is not a fault with the pack. Running one full charge cycle brings the cells to 4.8V nominal, which gives enough headroom above the cutoff to absorb the transmit spike without tripping the shutdown. After that first full charge, the cutout behaviour stops.

Bar indicator showing one fewer bar than expected after installing this pack

The GXT200 reads battery level by measuring terminal voltage against fixed thresholds — it has no fuel gauge chip. A new pack fresh out of packaging sits at storage voltage, not full-charge voltage, so the radio maps it to a lower bar tier than the actual capacity warrants. This makes the battery look partially used when it isn't. Place the pack in the charger and run a complete charge cycle to bring terminal voltage to the full-charge threshold. Once voltage clears that threshold, the indicator will read correctly.