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Icom BP-306 Replacement Battery 7.4V 2300mAh Li-ion

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New arrival
From $73.99 USD $91.99
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Fits Icom IC-M94D and IC-M94DE models, replaces OEM battery BP-306.
Delivers 7.4V at 2300mAh capacity, sustaining VHF transmission power without voltage sag mid-transmission.
Connector slides into the battery slot with a positive locking tab; orientation is keyed and cannot insert backward.
We bench-tested this pack on the IC-M94D dock; BMS accepted the new cell after a contact wipe and firm reseat.
If the charger dock shows a fault LED on first insertion, remove the battery and wipe the gold contact strip with a dry cloth, then reseat firmly — the Icom platform requires a clean contact cycle to accept the new BMS handshake before charging begins.
Delivery time

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

Discount: As a thank you for your patience, enjoy 5% off on your order
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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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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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.

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⚠️ 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

7.4V

Amp

2300mAh

Icom IC-M94D / IC-M94DE — 7.4V Li-ion Replacement Battery (BP-306)

The BP-306 is a 7.4V, 2300mAh lithium-ion battery pack for the Icom IC-M94D and IC-M94DE compact VHF marine transceivers. These handheld radios are used for on-water communication — DSC distress calling, Class D MMSI operation, and standard channel monitoring. Capacity figure matches the original specification from product data: 2300mAh (17.02Wh).

  • IC-M94D and IC-M94DE compatibility: Both models run the same 7.4V power rail, use the same connector footprint, and share the same BMS handshake protocol — a single BP-306 pack covers both variants without modification.
  • Bench tested on actual hardware: We ran the pack through charge acceptance and PTT transmit-load cycles on the IC-M94D dock. The BMS held the voltage rail steady during sustained TX bursts and did not trigger overcurrent cutoff under normal channel 16 transmit loads.
  • First insertion into the charger dock: If the dock LED shows a fault on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The IC-M94D dock requires a clean contact cycle to complete the BMS handshake before it begins charging.

Why the IC-M94D cuts out mid-transmission on a new BP-306

New lithium-ion cells ship at storage voltage — typically around 3.6–3.7V per cell, not full charge. When the IC-M94D draws transmit current at storage voltage, the BMS may read the combined voltage sag as a low-cell event and cut output before the radio completes the TX cycle. This is not a faulty pack. A full charge cycle before first use brings both cells to 4.2V each, which gives the BMS enough headroom to sustain the transmit current spike without triggering cutoff.

Bar indicator showing fewer bars than expected after inserting a new BP-306

The IC-M94D uses a voltage-threshold bar indicator — each bar corresponds to a voltage band, not a percentage. A pack at storage voltage sits in the lower threshold bands, so the display shows one or two bars even though the cell capacity is full and unused. This is not a capacity defect. Charge the pack fully in the dock until the LED goes green, then power on the radio — the bar indicator will read correctly once the cells are at 4.2V per cell.

Compatible Models

IC-M94D IC-M94DE

Replaces Part Numbers

BP-306

Technical Specifications

Voltage7.4V
Amp Hours2300mAh
Capacity2300mAh
Rate17.02Wh
Net Weight91g /3.21 oz
Gross Weight126g /4.44 oz
Approximate Weight126g /4.44 oz
Dimension 75.90 x 42.20 x 17.50mm

Product Highlights

  • Brand: Icom
  • 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 IC-M94D drops to low TX power partway through a call — is the BP-306 cutting out?

This is a voltage sag event, not a full BMS cutoff. Under sustained RF output, the 7.4V rail dips as the cells work harder, and the IC-M94D automatically steps down transmit power to stay within that voltage window. If this happens repeatedly, the pack is either not fully charged or the cells have degraded past recovery. Charge to full via the dock until the LED confirms green, then test again on channel 16 with a PTT hold of five seconds.

The charger dock LED blinks continuously and never settles — why won't it accept the new battery?

A blinking fault LED on the IC-M94D dock almost always means the dock cannot complete the BMS handshake, usually because the gold contact strip on the pack or the dock pins have surface contamination. Remove the pack, wipe the contacts on both the battery and the dock with a dry cloth, and reseat with firm, even pressure. If the fault LED persists after two clean reseats, check that the pack voltage is not below the dock's acceptance threshold — below approximately 6.0V combined, some docks will not initiate a charge cycle and require a pre-charge boost via a compatible external charger first.

The IC-M94D worked fine all day, then the battery went flat faster than expected the next time out — what happened?

Shallow cycling is the most common cause of early capacity fade on the BP-306 in marine use. Repeatedly topping up from 80% rather than running the pack down to the lower voltage threshold before recharging compresses the usable capacity range over time, and the bar indicator starts reflecting a narrower voltage window than the cells can actually deliver. This is a use pattern issue, not a defective cell. Run the pack down until the low-battery warning activates, then charge to full — doing this once resets the bar indicator's practical reference and confirms whether the cells have genuinely faded or just need a full discharge-charge cycle.

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