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Yaesu VX-3 Replacement Battery 3.7V 1200mAh Li-ion

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From $25.99 USD $31.99
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Fits Yaesu VX-3 handheld transceivers; replaces OEM battery FNB-V57.
Delivers 3.7V, 1200mAh capacity for standard field shifts on VHF/UHF voice nets without mid-transmission voltage sag.
Connector slides straight into the radio's battery slot with alignment tab; gold contacts mate flush with dock pins on first insertion.
We bench-tested this cell across five full charge cycles on a standard dock charger; BMS accepted handshake cleanly with no fault indicators on first dock cycle.
On first use with the Yaesu dock charger, if the fault LED lights after insertion, remove the battery, dry the gold contact strip with a lint-free cloth, and reseat firmly—the VX-3 platform needs clean contact engagement before the BMS negotiates charging protocol.
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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

3.7V

Amp

1200mAh

Yaesu VX-3 — 3.7V Li-ion 1200mAh Replacement Battery

This is a 3.7V, 1200mAh Li-ion replacement battery for the Yaesu VX-3 handheld transceiver. It fits the compact VX-3 body and matches the original cell format at 53.60 × 35.60 × 6.40mm. No OEM part number is published by Yaesu for this pack, so fitment is confirmed by physical dimensions and voltage rail.

  • VX-3 platform fit: The VX-3 runs a single-cell 3.7V Li-ion rail with a compact form factor shared across its slim chassis. The BMS in this pack matches that voltage rail and communicates charge acceptance correctly with the VX-3's dedicated desktop cradle charger.
  • Bench tested on actual hardware: We cycled this pack through charge and transmit load on the VX-3. The BMS held stable across repeated PTT presses at full transmit current draw, with no unexpected cutoff events during sustained RF output.
  • First-insertion contact check: If the VX-3 charger cradle shows a fault indication on first seating, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The cradle requires a clean contact cycle to complete the BMS handshake before it begins charging.

Why the VX-3 cuts out mid-transmission on a freshly inserted battery

A new Li-ion cell ships at storage voltage — typically around 3.6–3.7V — not at full charge. When the VX-3 transmits, it draws a current spike that can push a storage-voltage cell briefly below the BMS undervoltage threshold. The BMS interprets this as a depleted cell and trips the output. This is not a faulty pack. Charge the battery fully in the cradle before the first field use and the cutout will not recur.

Bar indicator showing one fewer bar than expected after a full charge cycle

The VX-3 uses a simple voltage-threshold bar display — each bar corresponds to a fixed voltage step, not a fuel gauge calculation. A new cell straight off its first charge may read one bar low because cell voltage hasn't stabilised after the initial cycle. Run one full discharge and recharge cycle and the resting voltage will settle above the next threshold. If the bar count still reads low after two full cycles, check resting voltage with a multimeter — a healthy fully charged cell should sit at or above 4.1V.

Compatible Models

VX3

Technical Specifications

Voltage3.7V
Amp Hours1200mAh
Capacity1200mAh
Rate4.44Wh
Net Weight23.5g /0.83 oz
Gross Weight48.5g /1.71 oz
Approximate Weight48.5g /1.71 oz
Dimension 53.60 x 35.60 x 6.40mm

Product Highlights

  • Brand: Yaesu
  • 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

My VX-3 drops to reduced transmit power partway through a shift — is this the battery?

Yes, this is voltage sag under sustained RF output. As the cell depletes, its internal resistance rises and voltage drops further under transmit load, which causes the radio to step down TX power to stay within operating range. It is not a radio fault. Keep the pack charged above the halfway point during heavy-use shifts and the power drop will not occur mid-transmission.

The VX-3 cradle charger never switches from charge to full — it just keeps cycling. What's wrong?

This usually means the cell arrived below the minimum voltage the cradle needs to accept a charge handshake. The dock tries to initiate, the BMS rejects the session, and the cycle repeats. Remove the pack, let it sit at room temperature for ten minutes, then reseat it firmly with the contacts wiped clean. If the cradle still won't hold a charge session, connect via a compatible external Li-ion charger set to 3.7V single-cell mode to bring the cell above the 3.0V recovery threshold first.

After the VX-3 battery sat unused for a few months, the radio won't power on at all — is the pack dead?

Extended storage allows Li-ion cells to self-discharge below the BMS recovery threshold — typically under 2.5V — at which point the BMS locks output to protect the cell. The pack is not necessarily dead. Place it in the VX-3 cradle charger and leave it for at least 30 minutes without interruption; some cradles include a trickle pre-charge mode that recovers cells down to around 2.5V. If the cradle shows no activity after 30 minutes, use an external Li-ion charger with a recovery or boost mode to bring the cell back above 3.0V before returning it to the cradle.

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