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Radon 302 Two-Way Radio Replacement Battery 7.4V 2600mAh

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New arrival
From $55.99 USD $68.99
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Fits Radon 302, 353, 354, 361 two-way radios with standard battery slot compatibility.
7.4V Li-ion at 2600mAh delivers sustained transmit power without voltage sag during extended field shifts.
Slides into vertical slot with gold contact strip facing dock; locking tab seats flush when fully inserted.
We bench-tested this cell on a 302 PTT cycle — BMS accepted handshake on first dock insertion, no fault LED.
On first charge in the Radon dock, if the charger LED blinks amber, remove the battery and wipe the gold contacts with a dry cloth before reinserting — the radio platform needs clean contact before accepting new cell firmware.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

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

Voltage

7.4V

Amp

2600mAh

Radon 302 / 353 / 354 / 361 Series — 7.4V Li-ion Replacement Battery

This 7.4V Li-ion pack delivers 2600mAh (19.24Wh) for the Radon 302, 353, 354, and 361 two-way radios. It replaces the original battery in compact Radon portables used across field and professional communication setups. Same voltage rail, same form factor, same BMS handshake requirements as the factory pack.

  • 302 / 353 / 354 / 361 platform fit: These four models share the same battery bay dimensions, 7.4V supply rail, and contact pin layout. One pack covers the full range without modification or adapter.
  • Bench tested on actual hardware: We ran this pack through charge acceptance, PTT transmit load cycling, and BMS cutoff verification. The protection circuit responded correctly to overcurrent events during sustained transmit bursts.
  • First insertion contact check: If the charger dock shows a fault LED on the first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The Radon dock runs a BMS handshake on contact — a film of oxidation or dust on the contacts is enough to break that cycle before charging starts.

Why the Radon 302 cuts out mid-transmission on a new battery

A new Li-ion cell ships at storage voltage — typically 3.6–3.7V per cell, not a full 4.2V. When you key the PTT on a radio at storage voltage, the transmit current spike can pull cell voltage below the BMS protection threshold for a split second. The BMS interprets that as an overcurrent event and cuts the pack. This is not a fault in the battery — it is the protection circuit working as intended on a cell that has not yet been fully charged. Charge the pack completely before first field use and the issue does not recur.

Bar indicator showing one fewer bar than expected after install

Radon portables use voltage-threshold bar indicators — each bar represents a voltage window, not a percentage from a fuel gauge chip. A new pack at storage voltage sits in the lower threshold window and displays fewer bars even though capacity is intact. This is a voltage reading, not a capacity problem. Put the pack through one full charge cycle in the dock until the charge LED goes green, then power on the radio — the bar indicator will reflect the correct resting voltage of approximately 8.3–8.4V across the pack.

Compatible Models

302 353 354 361 362

Technical Specifications

Voltage7.4V
Amp Hours2600mAh
Capacity2600mAh
Rate19.24Wh
Net Weight154g /5.43 oz
Gross Weight334g /11.78 oz
Approximate Weight334g /11.78 oz
Dimension 118.30 x 58.70 x 36.70mm

Product Highlights

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

Frequently Asked Questions

The Radon 302 drops to low TX power partway through a shift — is the new battery causing this?

Sustained RF output draws high current, and if cell impedance is slightly elevated from storage, voltage sags under that load. The radio's RF stage detects the sag and steps down transmit power to protect the circuit. This is not a defective pack — it typically clears after the first full charge-discharge cycle stabilises the cells. Charge fully, run the radio through normal use for one shift, and check again before drawing any conclusions.

My charger dock blinks continuously and never settles into a steady charge light — what's happening?

A continuous blink on the Radon dock usually means the pack voltage came in below the dock's acceptance threshold, which is common after extended shelf storage. The dock expects to see at least 6V across the pack before it will enter normal charge mode. Remove the battery, leave it out for 30 seconds, reseat it firmly ensuring the gold contacts are clean, and reinsert — some docks will reattempt the handshake and recover. If the blink persists, check that resting pack voltage is above 6.0V with a multimeter before assuming a dock or battery fault.

The radio powers on fine but the pack won't hold charge across a full shift after sitting unused for several months — is it dead?

Li-ion cells that sit below 3.0V per cell for an extended period can enter a partial BMS lockout state where the pack accepts only a trickle and reports low capacity. This is a deep-discharge storage issue, not a manufacturing defect. Place the pack in the dock and allow a full uninterrupted charge cycle of at least four hours without removing it. If the dock light goes green and resting voltage reads 8.3V or above on a multimeter, the pack has recovered and capacity should return to normal operating levels.

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