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Yaesu FNB-72 FT-817 Replacement Battery 9.6V 1500mAh

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New arrival
From $57.99 USD $71.99
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Replaces Yaesu FNB-72, FNB-72x, FNB-72xe, FNB-72xh, FNB-72xx, FNB-85, and SBR-32MH packs for FT-817, FT-817ND, and FT-818 portables.
9.6V, 1500mAh capacity delivers full-power transmit on HF, VHF, and UHF without voltage sag during sustained RF output.
Connector mates directly to FT-817 battery slot with single locking tab; orientation keyed to prevent reverse insertion.
We bench-tested this Ni-MH pack on FT-817 at 5W sustained output; BMS accepted dock voltage and held steady transmission without mid-session cutoff.
On first charge after storage, insert into Yaesu charger dock and allow full cycle without interruption — Ni-MH cells in this radio require complete charge window to establish proper voltage threshold for the bar indicator.
Delivery time

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

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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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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.

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

Voltage

9.6V

Amp

1500mAh

Yaesu FT-817 / FT-818 Series — 9.6V Ni-MH Replacement Battery (FNB-85)

This is a 9.6V, 1500mAh Ni-MH battery pack for the Yaesu FT-817, FT-817ND, and FT-818 portable HF/VHF/UHF transceivers. It replaces OEM part numbers FNB-72, FNB-85, and SBR-32MH. The pack slots into the same battery compartment as the original and connects via the same spring-contact rail.

  • FT-817 and FT-818 compatibility: Both radios share the same battery bay dimensions, spring-contact layout, and 9.6V nominal voltage rail. A single pack covers the full FT-817 and FT-818 lineup without modification.
  • Bench tested on actual hardware: We cycled this pack through transmit loads on the FT-817 bench rig. The cells held voltage above the radio's low-battery cutoff through repeated PTT bursts, and the BMS did not trip under the brief transmit current spike at full 5W output.
  • Ni-MH cycle conditioning on the FT-817: New Ni-MH cells ship at partial charge. Run two or three full discharge-charge cycles using the radio's normal receive-transmit operation before relying on the pack for field use — Ni-MH chemistry reaches rated capacity after break-in, not at first charge.

Why the FT-817 drops to 2.5W mid-transmission on a new pack

The FT-817 monitors rail voltage continuously and steps RF output down from 5W to 2.5W when voltage sags below roughly 8.5V under load. A new or unconditioned Ni-MH pack has not yet reached full cell capacity, so internal resistance is higher than a broken-in pack. Under sustained PTT, that resistance causes a voltage sag that crosses the radio's threshold and triggers the power step-down. Two to three full discharge-charge cycles lower cell impedance and restore stable voltage under transmit load.

Bar indicator showing one fewer bar than expected after inserting a new pack

The FT-817 uses a simple voltage-threshold bar indicator — it maps resting pack voltage directly to bar count. A new Ni-MH pack ships at storage voltage, typically around 9.0–9.2V, which sits one threshold below a fully charged pack at 9.6V. This is not a faulty cell. Charge the pack fully using the NC-72B or NC-88B dock before first use, and the bar indicator will read correctly once the pack reaches full resting voltage.

Compatible Models

FT-817 FT-817ND FT-818

Replaces Part Numbers

FNB-72 FNB-72x FNB-72xe FNB-72xh FNB-72xx FNB-85 SBR-32MH

Technical Specifications

Voltage9.6V
Amp Hours1500mAh
Capacity1500mAh
Rate14.4Wh
Net Weight440g /15.52 oz
Gross Weight490g /17.28 oz
Approximate Weight490g /17.28 oz
Dimension 98.00 x 57.00 x 14.50mm

Product Highlights

  • Brand: Yaesu
  • Manufacturer: CS
  • Series: Standard
  • Color: Green
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My FT-817 cuts out completely mid-transmission — is the new pack tripping the BMS?

Yes, this is a BMS overcurrent response to the transmit current spike. The FT-817 draws a sharp burst of current the moment PTT is pressed at 5W output, and an unconditioned Ni-MH pack can momentarily exceed the BMS overcurrent threshold. Run two full discharge-charge cycles to lower cell impedance, then retest — the trip threshold will no longer be crossed under normal PTT load.

The charger dock's charge LED never clears to green after I insert the new pack — what's wrong?

This happens when the pack resting voltage is below the dock's acceptance threshold, typically seen after extended storage. Remove the pack, let it sit at room temperature for 30 minutes, then reinsert firmly so all spring contacts seat fully. If the LED still does not clear, the pack voltage may need a recovery charge — some NC-series docks have a recovery mode activated by holding the pack in the dock for 10–15 minutes before the charge cycle initialises.

The FT-817ND shows full bars but transmit audio reports say I sound weak — what's causing that?

Weak transmitted audio under apparent full charge points to voltage sag under sustained RF load, not a display fault. The bar indicator reads resting voltage, but sustained transmit pulls the rail down mid-word. Check resting voltage with a multimeter — a fully charged 9.6V Ni-MH pack should read 10.0–10.2V at rest. If it reads below 9.6V after a full charge cycle, the pack needs a second conditioning cycle to bring cells up to rated capacity.

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