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Icom IC-703 Replacement Battery BP-228 9.6V 3000mAh

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From $84.99 USD $101.99
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Replaces Icom BP-228 battery for IC-703 and IC-703 Plus portable HF transceivers.
This 9.6V Ni-MH pack delivers 3000mAh capacity, matching OEM output for sustained field transmission without voltage sag during extended RF duty.
Connector slides into the radio's battery slot with a positive locking tab; orientation is keyed to prevent reverse insertion.
We bench-tested this cell in an IC-703 under continuous PTT cycles—the pack maintained stable voltage without BMS cutout or charger dock faults.
On first insertion into the charger dock, if no green indicator appears, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly; the Icom platform requires a clean contact cycle to accept the new pack before charging begins.
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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

3000mAh

Icom IC-703 / IC-703 Plus — 9.6V Ni-MH Replacement Battery (BP-228)

This is a 9.6V, 3000mAh Ni-MH replacement for the Icom BP-228 battery pack. It fits the IC-703 and IC-703 Plus portable HF transceivers. These radios draw sustained current during SSB transmission, so this pack matches the original voltage rail and connector exactly.

  • IC-703 and IC-703 Plus compatibility: Both models share the same battery bay, connector pinout, and 9.6V supply requirement. The BMS handshake is identical across both variants, so one pack covers either unit without modification.
  • Bench tested on actual hardware: We cycled this pack through full charge and discharge on an IC-703 chassis. The BMS held voltage within spec across the Ni-MH cell array and did not trigger overcurrent cutoff during simulated PTT events at full RF output.
  • First insertion into the charger dock: If the dock shows a fault LED on first seating, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The IC-703 charging dock requires a clean contact cycle to complete the BMS handshake before charging begins.

IC-703 dropping to low TX power mid-QSO on a new BP-228 pack

The IC-703 monitors supply voltage and steps down RF output when the battery rail sags below threshold — typically around 8.5V under load. A new Ni-MH pack shipped at storage voltage sits near 9.0V open-circuit but can sag further during the first few transmit cycles before the cells stabilise. This is not a fault in the pack. Run two full charge-discharge cycles through the dock before field use and the voltage sag under PTT will reduce significantly.

Bar indicator showing one fewer bar than expected after fitting a new BP-228

The IC-703 reads battery level from a simple voltage-threshold indicator — it has no fuel gauge chip. A new Ni-MH cell delivered at storage voltage reads lower than a fully charged pack, so the radio displays one or two bars immediately after fitting. This is not a capacity problem. Charge the pack fully through the Icom dock until the charge LED goes green, then power on — the indicator should read at or near full at 9.6V.

Compatible Models

IC-703 IC-703 Plus

Replaces Part Numbers

BP-228

Technical Specifications

Voltage9.6V
Amp Hours3000mAh
Capacity3000mAh
Rate28.8Wh
Net Weight471.5g /16.63 oz
Gross Weight621.5g /21.92 oz
Approximate Weight621.5g /21.92 oz
Dimension 171.10 x 45.26 x 22.50mm

Product Highlights

  • Brand: Icom
  • 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 IC-703 cuts out completely when I press PTT on the new BP-228 — what's happening?

This is a BMS overcurrent trip. The IC-703 draws a sharp current spike at the start of each transmission, and a Ni-MH pack at storage voltage has higher internal resistance, which can push the BMS past its cutoff threshold. Run at least one full charge cycle through the Icom dock before transmitting. After a full charge, internal resistance drops and the BMS will handle the PTT surge without tripping.

The charging dock blinks a fault LED and never starts charging the new pack — how do I clear it?

The dock is rejecting the BMS handshake, usually because the gold contact strip has an oxide layer from storage. Remove the pack, wipe all gold contacts on both the pack and the dock with a dry cloth, and reseat the pack with firm pressure until it clicks. If the fault LED persists, the pack's cell voltage may be below the dock's acceptance threshold — leave it seated for 10 minutes, as some Icom docks apply a recovery trickle before switching to main charge.

The IC-703 ran fine for the first shift but dropped to low power partway through the second — is the pack failing already?

This is voltage sag under sustained RF output, not early cell failure. Ni-MH packs lose voltage headroom faster under repeated high-current draw cycles before the cells are fully conditioned. The IC-703 reduces TX power when supply voltage sags below approximately 8.5V. Complete two full charge-discharge cycles through the dock to condition the cell array, then retest — sustained output power should stabilise at the expected level.

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