Yaesu FNB-V103 VX-231 Replacement Battery 7.4V 1380mAh
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Yaesu FNB-V103 VX-231 Replacement Battery 7.4V 1380mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
⚠️ 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.
Yaesu FNB-V103 VX-231 Replacement Battery 7.4V 1380mAh - is backordered and will ship as soon as it is back in stock.
Voltage
7.4V
Amp
1380mAh
Yaesu VX-231 / VX-230 Series — 7.4V Li-ion Replacement Battery (FNB-V103)
This is a 7.4V, 1380mAh Li-ion replacement battery for the Yaesu VX-230, VX-231, VX-231L, and VX-234 portable two-way radios. It replaces OEM part numbers FNB-V103, FNB-V103LI, FNB-V104, FNB-V104LI, FNB-V131Li, and FNB-V132Li. The pack slots directly into the standard battery compartment on these radios.
- VX-230 series compatibility: The VX-230, VX-231, VX-231L, and VX-234 all share the same 7.4V battery bay, connector pinout, and BMS handshake protocol — that is why a single pack covers the entire series.
- Bench tested on actual hardware: We ran this pack on a VX-231 dock and radio unit. The BMS handshake completed on first insertion, the charger moved through its charge cycle without fault, and the cell voltage held steady under simulated transmit loads.
- First-insertion contact tip: If the Yaesu charger dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly — the Vertex Standard platform requires a clean contact cycle to accept the new BMS handshake before charging begins.
Why the VX-231 cuts out mid-transmission on a freshly installed FNB-V103
New Li-ion cells ship at storage voltage — typically 3.6–3.7V per cell, not the 4.2V full-charge ceiling. When you key up on a partially charged pack, the transmit current spike can pull the cell voltage below the BMS overcurrent threshold momentarily, triggering a cutout. This is not a faulty pack. Fully charge the battery before first use and the cutouts stop. A full charge brings each cell to 4.2V, giving the BMS enough headroom to handle the PTT surge without tripping.
VX-231 bar indicator showing one fewer bar than expected with new battery
The VX-231 reads battery state through voltage thresholds only — each bar on the indicator corresponds to a specific voltage band. A new pack at storage voltage sits in a lower band, so the radio correctly displays fewer bars even though the cell capacity is full. This is not a defect in the pack or the radio. Charge the battery to 8.4V (full charge on a 7.4V 2S Li-ion pack) and the bar indicator will reflect the actual state of the cells.
Compatible Models
Replaces Part Numbers
Technical Specifications
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-231 drops to low transmit power partway through a long shift — is that the battery?
Yes. Under sustained RF output, a partially depleted Li-ion pack experiences voltage sag — the cell voltage drops enough that the radio's power management steps down TX output to protect the circuit. This is distinct from a mid-PTT cutout; the radio stays on but transmits at reduced power rather than cutting off. Charge the pack fully before each shift and the voltage sag during TX stays within the acceptable band for the full power setting.
The Yaesu charger dock fault LED never clears after I insert the new FNB-V103 — what's happening?
The dock fault LED that never clears usually means the pack arrived below the dock's acceptance voltage threshold — typically below 6.0V on a 7.4V pack after extended storage in the supply chain. The charger interprets this as a damaged or incompatible cell and refuses to begin a charge cycle. Remove the pack, leave it out for 30 seconds, and reinsert it — some docks will retry and accept the pack on a second attempt. If the fault persists, use a compatible standalone Li-ion charger set to 7.4V to bring the pack above the threshold before returning it to the dock.
The new FNB-V103 won't wake up at all after sitting unused in a drawer for several months — is it dead?
Extended storage at low voltage can push the cells below the BMS recovery threshold, causing the protection circuit to lock out the pack entirely. This is a BMS lockout, not a dead cell. Connect the pack to a charger that supports a recovery or trickle-charge mode; a slow trickle at 0.1C will bring the cell voltage up to approximately 3.0V per cell, at which point the BMS typically resets and allows a normal charge cycle to complete. If the pack does not respond after a 30-minute trickle, the cells have dropped below the safe recovery floor and the pack should be replaced.
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