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Radon 351 Two-Way Radio Replacement Battery 7.2V 2500mAh

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From $89.99 USD $107.99
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Fits Radon 351 and 352 two-way radios; replaces OEM battery pack for these models.
7.2V 2500mAh Ni-MH chemistry delivers sustained transmit power without mid-shift voltage sag on extended operations.
Slide connector matches Radon dock with positive contact on upper edge; locking tab seats flush against radio frame.
We bench-tested this cell in a 351 unit across ten full charge cycles; BMS accepted handshake on first insertion without dock fault.
If your charger dock blinks after inserting this battery, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly — the Radon platform needs clean contact contact before accepting the new cell.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

7.2V

Amp

2500mAh

Radon 351 / 352 — 7.2V Ni-MH Replacement Battery

This is a 7.2V 2500mAh Ni-MH battery for the Radon 351 and 352 two-way radios. It replaces the original pack directly, restoring full transmit power to radios where the existing cell has degraded. Capacity figure is from the product specification — 18Wh total energy.

  • 351 and 352 platform fit: Both models run the same 7.2V rail with a shared connector footprint and BMS handshake profile. One battery serves both without modification.
  • Bench tested on actual hardware: We cycled this pack through transmit-load draws and confirmed the BMS holds the voltage rail steady through sustained PTT keying without tripping into overcurrent cutoff.
  • First insertion contact check: If the charger dock shows a fault LED on first insertion, remove the pack, wipe the contact strip with a dry cloth, and reseat firmly. The dock needs a clean contact cycle to read the BMS correctly before it will begin charging.

Why the Radon 351 cuts out mid-transmission on a new battery

A new Ni-MH cell ships at storage voltage — typically 1.1–1.2V per cell, which puts this 6-cell pack around 6.6–7.2V before any conditioning. When you key PTT, transmit current spikes sharply. If the cell hasn't taken a full charge first, the voltage sags under that load and the BMS can trip the output to protect the pack. The radio then drops out mid-transmission. Run one full charge cycle before first use to bring the cells to operating voltage before placing the radio in service.

Bar indicator showing one fewer bar than expected after fitting a new pack

The Radon 351 uses a voltage-threshold bar indicator — it reads resting cell voltage and maps it to bars on screen. A new pack at storage voltage reads lower than a fully charged one, so the display shows one or two bars short of full. This is not a fault with the battery or the radio. Charge the pack fully and the indicator will step up to its correct reading. Expect the bar display to settle at maximum after the first complete charge.

Compatible Models

351 352

Technical Specifications

Voltage7.2V
Amp Hours2500mAh
Capacity2500mAh
Rate18Wh
Net Weight287.4g /10.14 oz
Gross Weight467.4g /16.49 oz
Approximate Weight467.4g /16.49 oz
Dimension 125.50 x 63.20 x 38.36mm

Product Highlights

  • Brand: Radon
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Radon 351 drops out every time I hold the PTT button for more than a few seconds — is this the battery?

This is almost always a transmit-current spike tripping the BMS on a pack that hasn't been fully charged yet. New Ni-MH cells arrive at storage voltage, and the sudden current draw during transmit pulls the pack voltage low enough to trigger cutoff. Charge the battery completely before putting the radio back into service. If drop-outs continue after a full charge, check that the contact strip on the battery is clean and seated flush in the radio's terminal block.

The charger dock is blinking a fault LED and won't start charging the new pack — what's causing it?

The dock is rejecting the handshake because the contact strip isn't making a clean connection, or the pack voltage is sitting below the dock's acceptance threshold from extended storage. Remove the battery, wipe the gold contacts on both the pack and the dock with a dry cloth, then reseat firmly. If the fault LED persists, leave the pack in the dock for 60 seconds — some chargers run a pre-charge trickle below the fault threshold to bring the cell up to acceptance voltage before switching to normal charge mode.

The radio switches to low-power transmit on its own partway through a shift — the battery still shows bars on the indicator.

This is voltage sag under sustained RF output, not a dead cell. As the pack depletes, internal cell impedance rises, and the voltage rail dips under the load of repeated transmissions even if resting voltage still reads high enough to show bars on screen. The radio's power management detects the sag and steps down TX output to protect the final-stage amplifier. Swap to a freshly charged pack mid-shift if sustained full-power transmission is required, and charge the depleted pack fully before the next use.

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