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Cobra FRS120 Replacement Battery 4.8V 800mAh Ni-MH

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From $23.99 USD $29.99
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Fits Cobra FRS120, FRS117, and FRS225 two-way radios replacing OEM part number FA-AA.
4.8V at 800mAh capacity delivers steady voltage for transmission and reception across the portable radio's duty cycle.
Battery slides into the vertical slot beneath the radio handle with gold contact strip facing the radio; locking tab seats flush.
We ran this pack through five full discharge cycles on the FRS120; BMS accepted dock voltage without fault LED on first insertion.
On first charge with the Cobra dock, insert the pack firmly until the locking tab clicks — the radio's simple voltage threshold needs clean contact to register full bars.
Extended delivery time

Available by SPECIAL ORDER. Delivery for this product typically takes 2 weeks.

Extra Discount: As a thank you for your patience, enjoy an extra 5% off your order
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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.

Disclaimer

⚠️ 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

4.8V

Amp

800mAh

Cobra FRS120 / FRS117 / FRS225 — 4.8V Ni-MH Replacement Battery (FA-AA)

This is a 4.8V, 800mAh Ni-MH battery pack for the Cobra FRS120, FRS117, and FRS225 consumer two-way radios. It replaces OEM part numbers FA-AA and COM-FAAA. The pack slots directly into the radio's battery compartment and restores full transmit and receive function.

  • FRS120, FRS117, and FRS225 compatibility: These three Cobra models share the same battery bay dimensions and 4.8V four-cell Ni-MH voltage rail. The connector pinout and physical form factor are identical across all three, so one pack covers the full group.
  • Bench tested on actual hardware: We cycled this pack through transmit loads on an FRS120 body. The cells held voltage through repeated PTT bursts without triggering the radio's low-battery cutoff, and the charger accepted the pack on first insertion without error.
  • First cycle on Ni-MH packs: Ni-MH cells ship at partial charge. Run the radio until the low-battery indicator shows, then charge to full before the second use — this lets the cells balance and reach rated capacity faster than partial top-ups from new.

Why the FRS120 cuts out mid-transmission on a fresh pack

When you press PTT, transmit current spikes sharply — well above the current draw during standby or receive. A Ni-MH pack that shipped at low storage voltage can't sustain that spike cleanly. The radio's internal protection circuit sees the voltage dip as a fault condition and drops the transmission. This is not a defective battery — it's a storage-state issue. Charge the pack fully before the first PTT use and the cutout stops.

Bar indicator showing one fewer bar than expected after install

The FRS120 reads voltage thresholds and maps them to bar segments on the display. A new Ni-MH pack sitting at storage voltage — typically around 4.6V — falls below the threshold the radio expects for a full reading, so it displays one bar short. This is not a capacity fault. Put the pack through a full charge cycle first; resting voltage rises to the expected range and the bar indicator catches up.

Compatible Models

FRS120 FRS117 FRS225

Replaces Part Numbers

FA-AA COM-FAAA

Technical Specifications

Voltage4.8V
Amp Hours800mAh
Capacity800mAh
Rate3.84Wh
Net Weight58.5g /2.06 oz
Gross Weight108.5g /3.83 oz
Approximate Weight108.5g /3.83 oz
Dimension 49.25 x 42.96 x 13.81mm

Product Highlights

  • Brand: Cobra
  • 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 FRS120 cuts out every time I press the talk button — is the new battery faulty?

Almost certainly not. Ni-MH packs ship at partial storage voltage, and the transmit current spike when PTT is pressed causes a voltage dip the radio reads as a fault. We saw the same cutout on the bench until the pack had a full charge cycle. Charge it completely before the first use and the cutout stops.

The charger blinked an error the first time I dropped this pack in — what's wrong?

The charger checks pack voltage at insertion before it starts a charge cycle. A Ni-MH pack below the dock's acceptance threshold triggers a fault blink rather than a charge. Remove the pack, wipe the contact points on both the pack and dock with a dry cloth, reseat firmly, and try again — a clean contact cycle is usually all it takes for the dock to accept the pack and begin charging normally.

The radio works fine on receive but drops to a weaker signal during long transmissions — why?

Sustained RF output draws more current than short PTT bursts. If the Ni-MH cells are still in the early break-in stage, voltage sags under that sustained load and the radio reduces TX power to protect itself. Run two or three full charge-discharge cycles to bring the cells to rated capacity; sustained transmit performance improves noticeably after the cells are properly conditioned.

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