Yaesu FNB-V105Li HX280S Replacement Battery 7.4V 1800mAh
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Yaesu FNB-V105Li HX280S Replacement Battery 7.4V 1800mAh - 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-V105Li HX280S Replacement Battery 7.4V 1800mAh - is backordered and will ship as soon as it is back in stock.
Voltage
7.4V
Amp
1800mAh
Yaesu HX280S / HX380 — 7.4V Li-ion Replacement Battery (FNB-V105Li)
This is a 7.4V 1800mAh Li-ion replacement battery for the Yaesu HX280S, HX280, HX280E, and HX380 handheld transceivers. It carries OEM part number FNB-V105Li and slots directly into the battery bay on all four models. Voltage and cell chemistry match the original Yaesu specification.
- HX280S / HX380 platform fit: All four models in this series share the same 7.4V rail, battery bay dimensions, and BMS handshake protocol. One pack works across the group because the connector pinout and communication lines are identical — no modification needed.
- Bench tested on actual hardware: We cycled this pack on the HX280S and monitored the BMS through transmit draw. The protection circuit responded correctly to PTT-triggered current spikes and held voltage within the expected operating window throughout.
- First insertion on a charger dock: If the dock shows a fault LED on first seat, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The Yaesu charging platform requires a clean contact cycle to complete the BMS handshake before current flow begins.
Why the HX280S cuts out mid-transmission on a new FNB-V105Li
A new Li-ion cell ships at storage voltage — typically around 3.7V per cell, giving roughly 7.4V at the pack terminals. During PTT, the HX280S draws a sharp transmit current spike. If the cell hasn't been through at least one full charge cycle, that spike can drag pack voltage below the BMS cutoff threshold momentarily, causing the radio to drop out. Run a full charge before the first transmission test. After one complete cycle, cell impedance settles and the BMS holds cleanly through sustained RF output.
Bar indicator showing one fewer bar than expected after fitting FNB-V105Li
The HX280S reads pack charge state through voltage thresholds, not a fuel gauge chip. A new pack at storage voltage sits at the boundary between bar levels, so the display shows one bar short of full. This is not a capacity fault. Charge the pack fully in the dock — once terminal voltage reaches approximately 8.4V at end of charge, the indicator will show the correct full-charge bar count.
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 HX280S drops to low TX power partway through a shift — is the new FNB-V105Li faulty?
This is voltage sag under sustained RF output, not a faulty cell. When the radio holds a long transmission, draw is high enough to pull pack voltage down temporarily, and the HX280S steps back TX power to protect the circuit. It happens most on a new pack that hasn't completed a full charge cycle yet. Charge fully to 8.4V, run one complete cycle, and the cell impedance drops enough to hold voltage steady through extended transmit.
The dock accepted the original Yaesu pack fine, but it's been flashing a fault LED with the new FNB-V105Li since day one — what's causing it?
A dock fault LED that never clears usually means the pack arrived below the dock's acceptance voltage threshold. Most Yaesu chargers won't begin a charge cycle if terminal voltage is under roughly 6.0V. Remove the pack, wipe both the gold contact strip on the battery and the dock pins with a dry cloth, and reseat firmly. If the LED clears and charging begins, a dirty contact broke the BMS handshake — if it still faults, the cell needs a boost charge to bring it above the acceptance floor before the dock will take over.
The HX380 cuts out the moment I press PTT — it powers on fine but kills immediately on transmit. What's happening?
PTT on the HX380 pulls a sharp current spike, and if the BMS reads that spike as an overcurrent event, it trips the protection circuit and shuts the pack down instantly. This is a BMS overcurrent trip, not a radio fault. Check that the gold contacts are clean and seated fully — a partial connection raises resistance and amplifies the apparent current spike. If the cutout persists after reseating, charge the pack fully; a cell below 7.0V has higher internal impedance and is more likely to trip the overcurrent threshold on transmit.
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